The submersible went missing on Sunday in the Atlantic, some 435 miles south of Newfoundland, Canada.
The Titan was launched as part of an expedition involving The Polar Prince, an icebreaker that was hired by OceanGate and formerly operated by the Canadian Coast Guard.
The ship ferried dozens of people and the submersible craft to the North Atlantic wreck site, where the Titan was scheduled to make multiple dives.
It is understood from OceanGate that Titan has a 96-hour oxygen supply in case of emergencies meaning only around two days of “life support” remain.
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Timelapse shows marine traffic after submersible goes missing.
What is the Titan?
The Titan is a small submersible operated by OceanGate – a US-based company which offers crewed submersibles for industry, research and exploration.
Tickets cost $250,000 (£195,000) for an eight-day trip including dives to the wreck.
According to the company, the Titan is capable of diving 13,120ft “with a comfortable safety margin”.
It takes the craft around two hours to descend approximately 12,500ft – where the Titanic wreck lies in a trench in the Atlantic.
The vessel, which weighs around 23,000lbs (10,432kg), operates by pinging back a message every 15 minutes to signal to those ashore that it is safe.
However, Sky News understands that those pings have stopped.
In a May 2021 court filing, OceanGate said the Titan had an “unparalleled safety feature” that assesses the integrity of the hull throughout every dive.
At the time of the filing, Titan had undergone more than 50 test dives, including to the equivalent depth of the Titanic, the company said.
During its 2022 expedition, OceanGate reported that the submersible had a battery issue on its first dive and had to be manually attached to its lifting platform, according to a November court filing.
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‘Challenging’ hunt for sub
What about the rescue effort?
US and Canadian ships and planes have been involved in the rescue efforts, but the remote location and depth make the operation particularly challenging.
Also, it is unclear whether the Titan is still underwater or had surfaced and was unable to communicate.
US Coast Guard Rear Admiral John Mauger said: “It is a remote area and it is a challenge to conduct a search in that remote area.
“We are deploying all available assets to make sure that we can locate the craft and rescue the people on board.”
The Polar Prince is being used to search the surface where the submersible was launched. Canadian Boeing P-8 Poseidon reconnaissance aircraft and two Lockheed C-130 Hercules aircraft also conducted overflights.
OceanGate Expeditions said it was “mobilising all options” to rescue those on board.
What do we know about the people on board?
• Hamish Harding
British billionaire Hamish Harding, 58, was confirmed as one of the passengers by his stepson Brian Szasz, who said on Facebook that his stepfather was in his “thoughts and prayers”.
Mr Harding is the current chairman of Action Aviation – a sales and operations company that offers a range of services in the business aviation industry.
Posting on social media before the trip, Mr Harding said he was joining OceanGate Expeditions – the company that supplied the vessel – as a mission specialist.
He wrote that due to bad weather in Newfoundland, Canada, the expedition was likely to be the first and only manned mission to the Titanic in 2023.
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Based in the United Arab Emirates – where Action Aviation headquarters is based – Mr Harding described himself on social media as a world explorer.
He holds the Guinness world record for the fastest circumnavigation of the Earth via the North and South Poles by an aircraft – 46 hours, 40 minutes and 22 seconds.
In 2016, Harding accompanied former astronaut Buzz Aldrin to the South Pole, when Aldrin became the oldest person ever to reach the Antarctic region, at 86.
Last year, he also took part in the fifth human space flight by Blue Origin – an American aerospace company founded by Jeff Bezos.
Jannicke Mikkelsen, an explorer and friend of Hamish Harding, told Sky News she believed Mr Harding would be an “important asset” to the others in the submersible.
“He will go through the emergency checklists and procedures together with the captain of the submersible,” she said.
“He will also be a good inspiration to the rest of the team to keep calm. I really believe Hamish is the one that can help lead this team – because he has been in tricky situations in the past on expeditions.
She added: “I’m terrified if they are stuck at the bottom of the ocean with 96 hours of air and not able to get back to the surface – this is what I fear the most.”
• Stockton Rush
Stockton Rush is chief executive and founder of OceanGate Inc – a company that provides crewed submersible services to enable researchers and explorers to access the oceans’ vast resources.
Having trained as a pilot, he became the youngest jet transport rated pilot in the world at the age of 19.
He is also a founder and member of the board of trustees of non-profit organisation OceanGate Foundation, which aims to catalyse emerging marine technology to further discoveries in marine science, history, and archaeology.
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OceanGate CEO speaks to Sky News
In an interview with Sky News back in February, Mr Rush spoke about visiting the Titanic wreck.
“What really strikes you is how beautiful it is,” he said. “You don’t normally see that on a shipwreck.
“It is an amazingly beautiful wreck.”
When asked if they can go inside the wreckage, Mr Rush said: “You can see inside, we dipped down and saw the grand staircase and saw some of the chandeliers still hanging.
“Next year we are hoping to send a small robot inside but for now we stay on the outside.”
• Paul-Henri Nargeolet
Paul-Henri Nargeolet is a former commander who served in the French Navy for 25 years.
During his service, he became the captain of the deep submergence group of the navy.
After leaving the navy he joined the French Institute for Research and Exploitation of the Sea, according to The Five Deeps Expedition – a company that assembles scientists, engineers and submersible operators for missions.
Mr Nargeolet has already led several expeditions to the Titanic site and has been involved in numerous scientific and technical expeditions around the world.
• Shahzada Dawood and his son Suleman
Pakistani businessman Shahzada Dawood and his son, Suleman, are also on board, their family said in a statement.
“We are very grateful for the concern being shown by our colleagues and friends and would like to request everyone to pray for their safety,” they added.
The Dawoods belong to one of Pakistan’s most prominent families, whose eponymous firm invests across the country in agriculture, industries and the health sector.
Mr Dawood, 48, also currently serves as the vice chairman of the board of Engro Corporation – a Pakistan-based conglomerate operating across a number of sectors including fertiliser and chemical production.
The UK-based businessman is also a trustee at the SETI Institute – a Silicon Valley not-for-profit working in space exploration.
Twelve British soldiers were injured in a major traffic pile-up in Estonia, close to the border with Russia, local media have reported.
Eight of the troops – part of a major NATO mission to deter Russian aggression – were airlifted back to the UK for hospital treatment on Sunday after the incident, which happened in snowy conditions on Friday, it is understood.
Five of these personnel have since been discharged with three still being kept in the military wing of the Queen Elizabeth Hospital in Birmingham.
The crash happened at an intersection at around 5pm on Friday when the troops were travelling in three minibuses back to their base at Tapa.
Two civilian cars, driven by Estonians, are thought to have collided, triggering a chain reaction, with four other vehicles – comprising the three army Toyota minibuses and a third civilian car – piling into each other.
According to local media reports, the cars that initially collided were a Volvo S80, driven by a 37-year-old woman and a BMW 530D, driven by a 62-year-old woman.
The Estonian Postimees news site reported that 12 British soldiers were injured as well as five civilians. They were all taken to hospital by ambulance.
The British troops are serving in Estonia as part of Operation Cabrit, the UK’s contribution to NATO’s “enhanced forward presence” mission, which spans nations across the alliance’s eastern flank and is designed to deter attacks from Russia.
Around 900 British troops are deployed in Estonia, including a unit of Challenger 2 tanks.
A spokesperson for the Ministry of Defence said: “Several British soldiers deployed on Operation CABRIT in Estonia were injured in a road traffic incident last Friday, 22nd November.
“Following hospital treatment in Estonia, eight personnel were flown back to the UK on an RAF C-17 for further treatment.
“Five have since been discharged and three are being cared for at the Royal Centre for Defence Medicine, Queen Elizabeth Hospital Birmingham. We wish them all a speedy recovery.”
Defence Secretary John Healey said: “Following the road traffic incident involving British personnel in Estonia, my thoughts are with all those affected, and I wish those injured a full, swift recovery.
“Thanks to the Royal Centre for Defence Medicine at Queen Elizabeth Hospital Birmingham for their excellent care.”
Two Britons are believed to be among more than a dozen people missing after a boat sank in the Red Sea off the Egyptian coast.
The yacht, called Sea Story, had 44 people on board, including 31 tourists of varying nationalities and 13 crew.
Authorities are searching for 16 people, including 12 foreign nationals and four Egyptians, the governor of the Red Sea region said, adding that 28 other people had been rescued.
Preliminary reports suggested a sudden large wave struck the vessel, capsizing it within about five minutes, governor Amr Hanafi said.
“Some passengers were in their cabins, which is why they were unable to escape,” he added in a statement.
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Passengers rescued from sunken tourist boat
The people who were rescued only suffered minor injuries such as bruises and scrapes with none needing hospital treatment.
A Foreign, Commonwealth and Development office spokesperson said: “We are providing consular support to a number of British nationals and their families following an incident in Egypt and are in contact with the local authorities.”
The foreign nationals aboard the 34-metre-long vessel, owned by an Egyptian national, included Americans, Belgians, British, Chinese, Finns, Germans, Irish, Poles, Slovakians, Spanish, and Swiss.
Sea Story had no technical problems, obtained all required permits before the trip, and was last checked for naval safety in March, according to officials.
The four-deck, wooden-hulled motor yacht was part of a multi-day diving trip when it went down near the coastal town of Marsa Alam following warnings about rough weather.
Officials said a distress call was received at 5.30am local time on Monday.
The boat had left Port Ghalib in Marsa Alam on Sunday and was scheduled to reach its destination of Hurghada Marina on 29 November.
Some survivors had been airlifted to safety on a helicopter, officials said.
The firm that operates the yacht, Dive Pro Liveaboard in Hurghada, said it has no information on the matter.
According to its maker’s website, the Sea Story was built in 2022.
A motion has been filed to drop the charges against Donald Trump of plotting to overturn the 2020 US presidential election result.
Mr Trump was first indicted on four felonies in August 2023: Conspiracy to defraud the United States, conspiracy to obstruct an official proceeding, obstruction of and an attempt to obstruct an official proceeding, and conspiracy against rights.
The president-elect pleaded not guilty to all charges and the case was then put on hold for months as Mr Trump’s team argued he could not be prosecuted.
On Monday, prosecutors working with special counsel Jack Smith, who had led the investigation, asked a federal judge to dismiss the case over long-standing US justice department policy, dating back to the 1970s, that presidents cannot be prosecuted while in office.
It marks the end of the department’s landmark effort to hold Mr Trump accountable for the attack on the US Capitol on 6 January 2021 when thousands of Trump supporters assaulted police, broke through barricades, and swarmed the Capitol in a bid to prevent the US Congress from certifying Joe Biden’s 2020 election victory.
Trump plays blinder as accusers forced to turn blind eye over Capitol riots
In winning the White House, he avoids the so-called ‘big house’.
Whether or not prison was a prospect awaiting Donald Trump is a moot point now, as he now enjoys the protection of the presidency.
The delay strategy that he pursued through a grinding court process knocked his federal prosecution past the election date and when his numbers came up, he wasn’t going down.
Politically, and legally, he has played a blinder.
Mr Smith’s team had been assessing how to wind down both the election interference case and the separate classified documents case in the wake of Mr Trump’s election victory over vice president Kamala Harris earlier this month, effectively killing any chance of success for the case.
In court papers, prosecutors said “the [US] Constitution requires that this case be dismissed before the defendant is inaugurated”.
They said the ban [on prosecuting sitting presidents] “is categorical and does not turn on the gravity of the crimes charged, the strength of the government’s proof, or the merits of the prosecution, which the government stands fully behind”.
Mr Trump, who has said he would sack Mr Smith as soon as he takes office in January, and promised to pardon some convicted rioters, has long dismissed both the 2020 election interference case and the separate classified documents case as politically motivated.
He was accused of illegally keeping classified papers after leaving office in 2021, some of which were allegedly found in his Mar-a-Lago home in Florida.
The election interference case stalled after the US Supreme Court ruled in July that former presidents have broad immunity from prosecution, which Mr Trump’s lawyers exploited to demand the charges against him be dismissed.
Mr Smith’s request to drop the case still needs to be approved by US District Judge Tanya Chutkan.
At least 1,500 cases have been brought against those accused of trying to overthrow the election result on 6 January 2021, resulting in more than 1,100 convictions, the Associated Press said.
More than 950 defendants have been sentenced and 600 of them jailed for terms ranging from a few days to 22 years.