A long-serving Air Force chief will take on a new role protecting Australia from cybersecurity threats as the country seeks to step up its response to the growing threat in that area.

Air Marshal Darren Goldie, who has been serving as Air Commander Australia, will become the inaugural National Cyber Security Coordinator, Prime Minister Anthony Albanese said.

The coordinator will lead national cybersecurity policy, the coordination of responses to major cyber incidents, whole of government cyber incident preparedness efforts and the strengthening of Commonwealth cybersecurity capability.

READ MORE: 'Catastrophic implosion': All five people on Titan sub dead

"We see this as a vital component of what modern government needs to do to respond to what our new and emerging challenges which are there, but also the incredible opportunities that come from advances in new technology," Albanese said today.

Home Affairs Minister Clare O'Neil said it was "a very substantial and seriously growing challenge" for Australia.

Goldie will begin his new role on July 3 this year.

"I have had the privilege to serve the Australian people for the last 30 years in the Australian Defence Force," he said.

"And I look forward to serving in this new role."

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Eight hours. And within them, many unanswered questions.

About an hour and a half after it dipped below the surface of the North Atlantic, a submersible on an expedition to view the wreckage of the Titanic lost communication with the surface Sunday.

It would take another nearly eight hours before the Canadian research icebreaker Polar Prince, supporting the Titan submersible, reported it missing to the Coast Guard — a report that triggered an intense international rescue effort.

READ MORE: Missing Titanic sub crew dead after 'catastrophic implosion'

The time lag has yet to be explained by the company that owns the submersible, OceanGate Expeditions.

But it may not have mattered – The US Coast Guard said Thursday the vessel imploded near the wreckage of the Titanic, killing all five people on board.

Coast Guard Rear Admiral John Mauger said it was too soon to say whether the implosion happened at the time of last communication. But it was not detected by sonar buoys used by search crews, he said, which suggests it happened before they arrived.

"We had listening devices in the water throughout and did not hear any signs of catastrophic failure from those," he said.

READ MORE: Director says 'surreal' similarities between Titanic and destroyed sub

Sean Leet, head of the company that co-owns the Titan's support ship, refused to discuss the timeline during a news conference Wednesday, saying only that "all protocols were followed for the mission."

But experts familiar with deep-sea exploration said those lost hours raise red flags.

"The time delay between declaring a submersible sunk and notification to outside resources and emergency responders appears to be excessive," said Robert Kraft, a deep-sea explorer who has located missing ships in the ocean.

The emergency procedure in question, he said, is typically declared after three consecutive scheduled communications are missed "but can vary slightly between organisations."

READ MORE: 'True explorers' mourned after undersea wreckage found

Others suggested the delay could have been due to the unorthodox approach taken by the company behind the experimental vessel.

Salvatore Mercogliano, a history professor at Campbell University in North Carolina who focuses on maritime history and policy, said the people on the Polar Prince likely didn't call for help after losing communication with the Titan because the submersible had previously experienced communication failures — so such an occurrence didn't raise immediate alarms.

The vessel used a rudimentary system that basically communicated with the surface ship through text message, Mercogliano said.

"They've lost communications before. And so what it appears is when they lost communications, they did not assume that this was a disaster at all," Mercogliano said.

READ MORE: Titanic sub customer calls 2021 dive to Titanic 'kamikaze operation'

"They probably were waiting for what was would have been the end of the scheduled voyage. And they probably waited for the period when they expected the Titan to come back to the surface," he speculated.

"They were unable to locate it. And then they knew they had an emergency."

Another thing to consider: Mercogliano said the Titan lacked an emergency radio beacon that could have floated to the surface and started beeping if there was an emergency.

"But they didn't have that," he said.

READ MORE: Wife of dead sub pilot is descendant of Titanic couple who perished

"And so it sounds like the Polar Prince waited the normal period of time for the recovery of this submersible to send out the mayday in distress."

Norman Polmar, a prominent naval analyst and author, said the protocol for "checking in" would be set by the company, and it varies by company and submersible. A company may say to check in every four hours and check in immediately if there's a problem, but there are absolutely no set rules with commercial submersibles, he added.

"From a military viewpoint, there are specific protocols. But from a commercial one, there is nothing that's standard," he said.

"If they said nine hours, that might have been what their agreement was — if we don't have a problem, we'll call you in nine hours. For civilian submersibles, it's what they want. Within the military, if you have got an experiment or test or trials, yes there is a fixed protocol."

Aaron Davenport, a maritime expert, senior policy researcher with the RAND Corporation and a retired US Coast Guard officer, said he's been perplexed by the operation's perceived lack of safety protocols given the inherent dangers, including the timing of when Polar Prince sent out its distress call.

First of all, Davenport said, the Titan and Polar Prince should have had a procedure in place in which they stayed in periodic contact, such as every hour or so.

"The protocol that is normally used in the Coast Guard operations, and in any kind of potentially dangerous situation, is that you want to maintain communications with someone on the surface or ashore that can call for help or render assistance in the event of an emergency," Davenport said.

"And so you would think they would check in with the surface on a regular basis," Davenport said.

"And then if you don't hear from them, then that would be an indication that you may need to start thinking about a potential rescue or getting things staged or invoke a plan, if you are unable to determine if they are safe or not."

Davenport added that most ships carry an emergency beacon, which is automatically deployed if the ship sinks. But he said he's seen no indication that the Titan had a way to alert anyone of an emergency situation.

In an email after an Associated Press interview, Davenport added that the vessel that launched the submersible appeared incapable of rescuing the vessel.

"They lost several hours early on — they should have started alerting folks and preparing for a rescue immediately," Davenport said.

"What is confounding is that they lost comms with the sub at the beginning of the mission, and it does not seem they had a good plan to restore comms and/or abort the mission."

Timeline: How the expedition unfolded

Friday, June 16

• Polar Prince departs St John's, Newfoundland, with submersible Titan on board

Sunday, June 18

• Polar Prince reaches the submersible launch site
• One hour and 45 minutes later communications with Titan are lost
• Vessel reported overdue at 9.13pm local time (12.13pm Monday AEST)
• Rescue mission is launched involving US and Canadian coast guards

Monday, June 19

• Rear Admiral John Mauger of the US Coast Guard says the submersible has between 70 and 96 hours of oxygen left
• It's confirmed the submersible had the full complement of five people on board, including UK billionaire Hamish Harding

Tuesday, June 20

• The search area expands to almost 26,000 square kilometres
• The identities of the others on board are confirmed, including OceanGate CEO Stockton Rush, who was piloting the vessel
• "Banging" noises are heard from beneath the ocean's surface

Wednesday, June 21

• Further banging noises are heard as all available search assets are redirected to that area
• The estimate oxygen supply available to those aboard the sub dwindles to under 20 hours

Thursday, June 22

• At about 7am ET (9pm Wednesday AEST), the Coast Guard announces a remote operated vehicle has reached the ocean floor
• The estimated 96-hour maximum deadline for the sub's oxygen supply runs out
• The US Coast Guard announces "debris" has been found near the wreck of the Titanic
• In a statement, OceanGuard says all five people on board the Titan are believed to be dead
• The US Coast Guard confirm the deaths, saying five pieces of debris have been found that can be matched to the missing sub
• It's believed to have been destroyed in a "catastrophic" implosion

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Households all across Australia are bracing themselves for increases to their power bills when the new financial year kicks in.

However, not all the rises are equal.

Because different areas of the country have different energy markets, some Australians will be hit by a hike ten times that of others.

READ MORE: How families can save $300 a month on energy bills this winter

Add to that different prices to begin with and different rebates announced by state governments in their budgets this year, we have a scenario where the power bill pain isn't being shared around equally.

This is how each state and territory will fare once the new prices kick in on July 1.

New South Wales, South-East Queensland and South Australia

NSW, South-East Queensland and South Australia are the three areas of the country affected by the Australian Energy Regulator's (AER) decision last month on the default market offer (DMO) electricity retailers can charge.

In NSW, residents will see an increase of between about 19 and 25 per cent, depending on what network their area of the state is covered by.

Distribution zone	Yearly increase for residential customers without controlled load	Yearly increase for residential customers with controlled load
Ausgrid (Sydney, Central Coast, Hunter Valley)	$315 (20.8%)	$440 (20.7%)
Endeavour (Western Sydney, Blue Mountains, Southern Highlands, Illawarra, South Coast)	$392 (21.4%)	$594 (24.9%)
Essential	$435 (20.8%)	$487 (19.6%)

There are a number of different energy rebates available for NSW residents, but because the state budget isn't due to be handed down until September due to the election earlier this year, cost-of-living relief specific to the year is yet to be announced by the new Labor government.

South Australians are in a similar ballpark, with price increases of around 23 per cent.

Distribution zone	Increase for residential customers without controlled load	Increase for residential customers with controlled load
SAPN (South Australia)	$439 (23.9%)	$512 (22.5%)

Some residents, however, will receive a rebate to offset the increase.

The state government, as part of its budget, announced around 420,000 households will be eligible for a rebate of up to $500 on their electricity bills in the 2023-24 financial year.

In South-East Queensland, the electricity price increase is slightly lower than in South Australia, with the DMO going up by around 21 per cent:

Distribution zone	Increase for residential customers without controlled load	Increase for residential customers with controlled load
Energex (South-East Queensland)	$349 (21.5%)	$402 (20.5%)

However, Queenslanders will see their bill hikes offset by a number of cost-of-living initiatives announced in the state budget.

All households get a $550 rebate, while eligible vulnerable residents get a $700 rebate, on top of $372 under the Queensland Electricity Rebate Scheme.

READ MORE: 'Insane': Aussies' power price shock as bills surge up to 83 per cent

Regional Queensland

The rest of Queensland isn't covered by the AER's decision, with the Queensland Competition Authority instead responsible for regulating retail electricity prices in regional areas of the state.

It ruled earlier this month that electricity prices would rise by up to 28.7 per cent:

Regional Queensland	Yearly increase
Tariff 11	$429 (28.7%)
Tariff 31	$59 (20.1%)
Tariff 33	$52 (17.3%)

Most regional Queenslanders are on Tariff 11, while 31 and 33 are often used in conjunction with it for appliances that don't require constant electricity, such as hot water systems.

As with the rest of the state, residents in regional Queensland get access to the $550 energy rebate, and vulnerable residents get the combined $1072 bill relief. 

EXPLAINED: Your tax return is going to look different this year. These are the changes you need to know about

Victoria

Like NSW, Queensland and South Australia, Victoria is also part of the National Energy Market (NEM).

However, its default offer prices are set by the state's Essential Services Commission.

On average, prices across the state will increase by a full 25 per cent, although that varies by provider:

Provider	2022-23 average annual bill	2023-24 average annual bill	Increase
AusNet	$1632	$2026	24.1%
CitiPower	$1293	$1571	21.5%
Jemena	$1352	$1720	27.2%
Powercor	$1412	$1793	27%
United Energy	$1324	$1666	25.8%
Victorian average	$1403	$1755	25.1%

Again, there's some bill relief available from the state government.

Victorians who use the state's Energy Compare website to search for the cheapest electricity deal get access to the $250 Power Saving Bonus payment.

READ MORE: What are phone porting scams, and is there anything you can do about them?

Western Australia

Unlike the other states, Western Australia is not part of the NEM.

Instead, it has a completely regulated energy market, meaning power prices are set by the government.

In the 2023-24 state budget, it was announced the residential electricity tariff would be increased by 2.5 per cent.

Government papers estimate this makes for a rise of about $44 to bills for the average "representative" household.

On top of that, the government also announced a $400 discount on all households' electricity bills.

This will be in the form of two energy bill credits of $200 apiece – one each for the July-August and November-December billing cycles.

READ MORE: Key end of financial year money-saving deadlines you need to know

Tasmania

Another state in the NEM, Tasmania doesn't regulate competition in its energy market but does regulate prices.

The state's Economic Regulator announced this week that prices will increase, on average, by 9.51 per cent from July 1.

It estimated this price rise will see the average residential customer's bill go up by $200.

The Tasmanian government, meanwhile, announced 140,000 households will be eligible for $250 in energy price relief over the next two years.

READ MORE: La Niña and El Niño: Will we switch from one to the other in 2023?

ACT

Just like Tasmania, the ACT regulates energy prices while being on the NEM.

In early June, the Independent Competition and Regulatory Commission ruled electricity tariffs will rise by an average of 4.15 per cent for 2023-24.

The impact on the average households, it wrote, would be a $75 increase over the course of the year.

Northern Territory

The Northern Territory, like Western Australia, is not on the NEM.

The government regulates prices in its territory budget each year.

For the second year in a row, utility tariffs in the NT will be increased by 2.7 per cent.

READ MORE: How to report scams in Australia and what you can do to stay safe

So who comes out best?

Perhaps unsurprisingly, it's generally the states and territories with regulated energy prices getting the smallest increases, with the ACT and WA doing particularly well.

Western Australians are once again the winners when it comes to state energy price relief (not the federal government's Energy Bill Relief Fund which, of course, applies across the country).

State/territory	Electricity price increase for average customer	Local energy relief
ACT	$75 (4.15%)	–
NSW	$315-594 (19.6-24.9%)	Range of different rebates
NT	2.7%	–
South-East Queensland	$349-$402 (20.5-21.5%)	$550 for all households, $1072 for vulnerable households
Regional Queensland	$429 (28.7%)	As above
SA	$439-$512 (22.5-23.9%)	$500 for 420,000 eligible households
Tasmania	$200 (9.51%)	$250 for 140,000 eligible households
Victoria	$352 (25.1%)	$250 for customers who use Energy Compare website
WA	$44 (2.5%)	$400 for all households

The information provided on this website is general in nature only and does not constitute personal financial advice. The information has been prepared without taking into account your personal objectives, financial situation or needs. Before acting on any information on this website you should consider the appropriateness of the information having regard to your objectives, financial situation and needs.

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All five passengers on board the missing submersible that disappeared on a voyage to the wreckage of the Titanic have been confirmed dead, after debris was found in a massive international search effort.

The US Coast Guard said the vessel, vanished in a remote part of the North Atlantic Ocean, appeared to have suffered a "catastrophic implosion" and the crew's families had been notified.

A top secret US navy acoustic detection system, designed to spot enemy submarines, is reported to have first heard the implosion, hours after the submersible began the mission.

READ MORE: 'Debris field' found in search for missing Titanic submersible

https://omny.fm/shows/ben-fordham-full-show/breaking-5-lives-lost-in-titanic-submarine-tragedy/embed

The Thursday afternoon (early Friday morning AEST) announcement confirmed what many had feared even as ship after ship rushed to the huge search area in the hope of saving the five people on board.

It came minutes after OceanGate, the company responsible for the submersible vessel, announced it believed the crew members had died.

The five aboard were pilot Stockton Rush, the CEO of OceanGate; British adventurer and billionaire Hamish Harding; Pakistani businessman Shahzada Dawood and his son Suleman; and French explorer and Titanic expert Paul-Henry Nargeolet.

"These men were true explorers who shared a distinct spirit of adventure, and a deep passion for exploring and protecting the world's oceans," the company said.

"Our hearts are with these five souls and every member of their families during this tragic time. We grieve the loss of life and joy they brought to everyone they knew."

READ MORE: Tourist sub customer calls 2021 dive to Titanic a 'kamikaze operation'

US Coast Guard Rear Admiral John Mauger said a remotely operated vehicle (ROV) found the tail cone of the Titan submersible roughly 500 metres from the wreckage of the Titanic ocean liner, which sunk in 1912, killing all but about 700 of the roughly 2200 passengers and crew.

The vehicle crawling on the sea floor kilometres under the ocean's surface eventually found a total of five large pieces of debris he said was "consistent with a catastrophic loss of the pressure chamber".

"Upon this determination, we immediately notified the families," he said.

"On behalf of the United States Coast Guard and the entire Unified Command, I offer my deepest condolences to the families.

"I can only imagine what this has been like for them and I hope that this discovery provides some solace during this difficult time."

READ MORE: Years before sub went missing, letter warned of 'catastrophic' design 

Tributes to the Titan passengers poured in quickly after the confirmation.

Mauger said efforts would continue to find the adventurers' bodies but stressed the "incredibly unforgiving environment" the ROVs were dealing with. 

The rear admiral said it was too early to tell when the implosion occurred but that extensive monitoring equipment put to sea as authorities searched an area the size of Greater Sydney didn't pick up any noise consistent with such a big bang.

The "banging" noises heard across two days, which gave hope to those following the rescue attempt and were used by rescuers to focus a search zone, didn't appear to have come from the submersible, he said.

READ MORE: Wife of dead submersible pilot is descendant of Titanic couple who perished

Mauger said personnel and some of the nine vessels still on site would begin to leave the area in the next 24 hours but he couldn't say when remote operations on the sea floor were expected to end.

He declined to comment on potential changes to safety ratings or inspections, saying they'd be subject to a future review.

"This is something that happened in a remote portion of the ocean with people from, you know, several different countries around the world," he said.

And so it is a complex case to work through but I'm confident that those questions will begin to get answered."

Retired naval officer Dr William Parker, who knew Rush and Nargeolet, said experimental vessels didn't have the same "rigour for safety" as commercial vehicles and called for consideration of who was allowed to travel on such craft.

"The reality is that it looks like they did pass quite quickly," he told Today.

"If you have an implosion like that, if there is any good news, it is they probably didn't suffer very long. 

"Of course it's very sad and it brings up some potential improvements that we need to make in the future as we work with these types of vessels."

Titanic director James Cameron, who travelled to the wreckage in 2001, said he was "struck" by the similarities to the ocean liner's disaster more than a century ago.

The Titanic's captain ignored warnings about ice in the North Atlantic, and the movie director said deep-sea explorers voiced concerns about the Titan submersible, saying it was too experimental to carry passengers.

"To take place at the same exact site with all the diving that's going on all around the world, I think it's just astonishing," Cameron told the TV station.

"It's really quite surreal."

Earlier on Thursday (late Thursday night AEST), the mission passed the critical 96-hour mark when breathable air could have run out, a grim moment in the intense international effort to save the five people aboard.

The Titan submersible was estimated to have about a four-day supply of breathable air when it launched on Sunday morning in the North Atlantic.

Experts had emphasised that was an imprecise approximation to begin with and could be extended if passengers had taken measures to conserve breathable air.

But they also stressed the challenges were enormous, even if the adventurers on board had managed to survive for days.

In just one example of the difficulties rescuers faced, the PRS Odysseus 6K ROV rated to 6000 metres that found the debris needed two massive C-17 transport planes to bring it to the search area. 

READ MORE: How the wreck of the Titanic was first rediscovered

Even so, they rushed more ships and vessels to the site of the disappearance, hoping underwater sounds they detected for a second straight day might help narrow their search in the urgent, international mission.

They expanded the coverage area to thousands of kilometres — twice the size of Greater Sydney, and in waters four kilometres deep.

READ MORE: Titanic tourism is a thing, and it's dangerous

The Titan was reported overdue on Sunday afternoon about 700 kilometres south of St John's, in the Canadian province of Newfoundland, as it was on its way to where the iconic ocean liner sank more than a century ago.

OceanGate Expeditions has been chronicling the Titanic's decay and the underwater ecosystem around it via yearly voyages since 2021.

Timeline: How the expedition unfolded

Friday, June 16

• Polar Prince departs St John's, Newfoundland, with submersible Titan on board

Sunday, June 18

• Polar Prince reaches the submersible launch site
• One hour and 45 minutes later communications with Titan are lost
• Vessel reported overdue at 9.13pm local time (12.13pm Monday AEST)
• Rescue mission is launched involving US and Canadian coast guards

Monday, June 19

• Rear Admiral John Mauger of the US Coast Guard says the submersible has between 70 and 96 hours of oxygen left
• It's confirmed the submersible had the full complement of five people on board, including UK billionaire Hamish Harding

Tuesday, June 20

• The search area expands to almost 26,000 square kilometres
• The identities of the others on board are confirmed, including OceanGate CEO Stockton Rush, who was piloting the vessel
• "Banging" noises are heard from beneath the ocean's surface

Wednesday, June 21

• Further banging noises are heard as all available search assets are redirected to that area
• The estimate oxygen supply available to those aboard the sub dwindles to under 20 hours

Thursday, June 22

• At about 7am ET (9pm Wednesday AEST), the Coast Guard announces a remote operated vehicle has reached the ocean floor
• The estimated 96-hour maximum deadline for the sub's oxygen supply runs out
• The US Coast Guard announces "debris" has been found near the wreck of the Titanic
• In a statement, OceanGuard says all five people on board the Titan are believed to be dead
• The US Coast Guard confirm the deaths, saying five pieces of debris have been found that can be matched to the missing sub
• It's believed to have been destroyed in a "catastrophic" implosion

– Reported with CNN and Associated Press

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Tributes are emerging for the five people believed to have been killed on a deep-sea trip to view the wreckage of the Titanic.

OceanGate CEO Stockton Rush, British adventurer and billionaire Hamish Harding, Pakistani businessman Shahzada Dawood and his son Suleman, and French explorer and Titanic expert Paul-Henry Nargeolet, were aboard the OceanGate submersible Titan, which went missing in the Atlantic Ocean on Sunday.

The disappearance of the sub triggered a massive, multi-day international search.

READ MORE: Director James Cameron on 'surreal' similarities between sub destruction and Titanic disaster

Early this morning, searchers said they had found debris near the wreck of the doomed oxean liner, and later confirmed it belonged to Titan.

It's now believed the sub suffered a "catastrophic" implosion and all five aboard were killed.

The president of The Explorers Club, to which Harding and Nargeolet belonged, expressed his grief today.

https://twitter.com/OceanGateExped/status/1671976846827876352?ref_src=twsrc%5Etfw

Richard Garriott de Cayeux thanked the many groups involved in the search and rescue mission and the many others around the world "who have mobilised personnel and resources to support the search and rescue."

"Hamish Harding is a dear friend to me personally and to The Explorers Club. He holds several world records and has continued to push dragons off maps both in person and through supporting expeditions and worthy causes," de Cayeux said.

"Paul-Henri was elected to the Club in 2001 and was one of the foremost experts on submersible expeditions to the Titanic."

He said both Harding and Nargeolet were "drawn to explore" to try to advance science and "for the betterment of mankind."

De Cayeux added that Rush, who was the CEO and chairman of OceanGate who operated the Titan, was a friend of the club and gave lectures at its headquarters.

"While we did not know Shahzada Dawood and his son Suleman personally, their desire to explore as a family would have led them to our doorstep at some point in their futures, where we would have welcomed them," he said.

READ MORE: Tourist sub customer calls 2021 dive to Titanic a 'kamikaze operation'

Rush's company OceanGate, which owned the submersible and carried out the expedition, paid tribute to those aboard.

"These men were true explorers who shared a distinct spirit of adventure, and a deep passion for exploring and protecting the world's oceans," the company said in a statement.

"This is an extremely sad time for our dedicated employees who are exhausted and grieving deeply over this loss."

Co-founder Guillermo Söhnlein told CNN it was a "tragic loss".

"All five crew members were passionate explorers. And they died doing what they believed in," he said.

SETI Institute CEO Bill Diamond, a friend of Shahzada Dawood, said he had not been a "risk-taker".

"I think he looked at this as an extraordinary adventure," Diamond told Today.

"I'm sure he saw this as an extraordinary thing to share with his son, and I'm also sure that he would not have taken his son on board if he thought there was really, you know, a serious level of danger."

The White House has also expressed its sorrow.

"Our hearts go out to the families and loved ones of those who lost their lives on the Titan," the White House said in a statement.

"They have been through a harrowing ordeal over the past few days, and we are keeping them in our thoughts and prayers."

The statement also thanked the searchers, including the Coast Guard, involved in the international effort to find the submersible.

"This has been a testament to the skill and professionalism that the men and women who serve our nation continue to demonstrate every single day," the statement said.

The Pakistani government, meanwhile, offered their "deepest condolences" to the Dawood family.

"We appreciate the multinational efforts over the last several days in search of the vessel," the country's Foreign Ministry wrote on Twitter.

The Dawoods are members of one of Pakistan's most prominent families and their firm, Dawood Hercules Corp, based in Karachi, is involved in agriculture, petrochemicals and telecommunication infrastructure.

Timeline: How the expedition unfolded

Friday, June 16

• Polar Prince departs St John's, Newfoundland, with submersible Titan on board

Sunday, June 18

• Polar Prince reaches the submersible launch site
• One hour and 45 minutes later communications with Titan are lost
• Vessel reported overdue at 9.13pm local time (12.13pm Monday AEST)
• Rescue mission is launched involving US and Canadian coast guards

Monday, June 19

• Rear Admiral John Mauger of the US Coast Guard says the submersible has between 70 and 96 hours of oxygen left
• It's confirmed the submersible had the full complement of five people on board, including UK billionaire Hamish Harding

Tuesday, June 20

• The search area expands to almost 26,000 square kilometres
• The identities of the others on board are confirmed, including OceanGate CEO Stockton Rush, who was piloting the vessel
• "Banging" noises are heard from beneath the ocean's surface

Wednesday, June 21

• Further banging noises are heard as all available search assets are redirected to that area
• The estimate oxygen supply available to those aboard the sub dwindles to under 20 hours

Thursday, June 22

• At about 7am ET (9pm Wednesday AEST), the Coast Guard announces a remote operated vehicle has reached the ocean floor
• The estimated 96-hour maximum deadline for the sub's oxygen supply runs out
• The US Coast Guard announces "debris" has been found near the wreck of the Titanic
• In a statement, OceanGuard says all five people on board the Titan are believed to be dead
• The US Coast Guard confirm the deaths, saying five pieces of debris have been found that can be matched to the missing sub
• It's believed to have been destroyed in a "catastrophic" implosion

READ MORE: Wife of dead submersible pilot is descendant of Titanic couple who perished

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Business rivalry seemingly isn't enough for two of the tech industry's most powerful billionaires. Now Elon Musk and Mark Zuckerberg say they want to settle their scores in a cage fight.

Twitter owner and Tesla CEO Musk recently tweeted that he would be "up for a cage fight" with Zuckerberg, the CEO of Meta.

In an Instagram story on Wednesday (Thursday morning AEST), Zuckerberg fired back by posting a screenshot of Musk's tweet overlaid with the caption "Send Me Location".

READ MORE: 'Debris field' found in search for missing Titanic submersible

Musk then responded to a tweet about the fight by Alex Heath, a deputy editor of tech news website Verge, with "Vegas Octagon" — a reference to the Las Vegas arena that hosts the Ultimate Fighting Championship.

"I have this great move that I call 'The Walrus,' where I just lie on top of my opponent & do nothing," he added in a separate tweet.

CNN has contacted Meta for comment. A spokesperson for the company told Verge: "The [Instagram] story speaks for itself."

It remains unclear whether Zuckerberg and Musk are serious or having a laugh.

The two — who in the past jostled for a high spot on the Bloomberg Billionaires Index before Musk became the world's richest man — have clashed before.

READ MORE: Single ticket wins entire $100 million Powerball jackpot 

https://twitter.com/elonmusk/status/1671704483598925825

They have history

In 2017, they engaged in a very public feud over the future of artificial intelligence.

Musk had repeatedly warned about the dangers of AI, describing it as a potentially existential threat to the human race. Zuckerberg, on the other hand, took a much more optimistic view.

During a Facebook Live broadcast at the time he dismissed "naysayers" who sketched out "doomsday scenarios" as being "pretty irresponsible".

Musk shot back shortly afterward, tweeting: "I've talked to Mark about this. His understanding of the subject is pretty limited."

Musk knocked Zuckerberg from the number three spot on the Bloomberg Billionaires Index in 2020, before becoming the richest person in the world soon after that.

READ MORE: 'I've just got to cop it on the chin': NRL pitch invader learns fate 

He was briefly ousted from the top spot in December by Bernard Arnault, the chairman of French luxury goods giant LVMH, before reclaiming his title in May. Zuckerberg is now in the 10th position.

Quite who would win in a cage fight remains to be seen. Musk is physically bigger than Zuckerberg, but the Meta chief practices jiu-jitsu, the Brazilian martial art, and won gold and silver in a tournament in May.

READ MORE: Carcass of 2.9-metre white shark washes up on South African beach 

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A father has been shot while trying to stop two masked intruders breaking into his home in the middle of the night in Melbourne's east.

Police said two armed offenders tried to enter the home on Sturdee Road in Donvale about 1.40am.

The 46-year-old man was shot during the incident, while his wife and teenage daughter were unharmed.

READ MORE: Aussie city plays host to one of nature's greatest mysteries

He was taken to hospital in a stable condition with serious injuries.

Neighbour Ralph Learmont said he heard a "very loud" bang.

"It was a piercing bang," he said.

"About 15 or 20 seconds later, I think there was another bang."

9News understands two men were seen driving up and down the street in the lead-up to the attack before they parked their car and got out.

"I was shaken. It was pretty scary," Learmont said.

Police are continuing to investigate.

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Cherie Guest may still be alive today if an eye surgeon had not operated on her while she was struggling to breathe.

As she lay on the operating table, the 61-year-old begged the surgeon to stop halfway through her cataract procedure, but he continued.

Her breathing deteriorated and she died after being taken to a public hospital in an ambulance.

READ MORE: Aussie city plays host to one of nature's greatest mysteries

A Victorian coroner on Thursday found Guest's death was preventable and would not have occurred if specialists had cancelled her surgery.

Guest visited Melbourne ophthalmologist Joseph San Laureano's for a diabetic eye check, in July 2018, after being referred by her GP.

He said she needed surgery to remove a cataract and insert a stent to reduce eye pressure.

But Guest, who had several pre-existing health conditions, told the surgeon was could not lie flat due to breathing issues.

She also relied on a home oxygen tank to breathe and used a wheelchair.

San Laureano decided he would perform a two-part operation using a laser machine for the first stage, instead of conventional cataract surgery.

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After the consultation, Guest and her daughter Angela were concerned and called the Victoria Parade Surgery Centre (VPSC) to request a trial run before the procedure.

However, the trial was not conducted by San Laureano, it was done by his employee.

When he was told the trial was successful he made no further inquiries about how it went or whether it was adequate.

On August 18, San Laureano failed to properly assess Guest's fitness and went ahead with the two-part surgery.

After the first part of the procedure ended, he continued with the second stage despite Guest asking for him to stop and her lips turning blue.

A nurse who tended to Guest told the inquest she was "alarmed" the surgery went ahead despite her high risk and severe breathing issues.

Other medical professionals were surprised San Laureano didn't notice she was unfit for the operation and one said he was "astounded" that the surgery proceeded.

Experts called to give evidence told the inquest into the death, even if she was assessed as being fit for the surgery, it should never have been performed at VPSC.

She should have only been operated on at a hospital with close links to critical and emergency care, they said.

San Laureano and an anaesthetist had breached their professional obligation to Guest in continuing with the surgery, Coroner Katherine Lorenz said.

"By failing to recognise medical risks to Guest… San Laureano's care fell well below the standard expected of him as a surgeon," she said.

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