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.
Donald Trump has threatened sweeping new tariffs on Mexico, Canada and China on his first day in office.
The president-elect, who takes office on 20 January next year, said he would introduce a 25% tax on all products entering the country from Canada and Mexico.
Posting on his Truth Social platform he also threatened an additional 10% tariff on goods from China on top of any he might impose as one of his first executive orders.
If implemented, the tariffs could raise prices for ordinary American consumers on everything from petrol to cars and agricultural products.
The US is the largest importer of goods worldwide and Mexico, China and Canada are its top three suppliers according to the country’s census data.
More than 83% of exports from Mexico went to the US in 2023 and 75% of Canadian exports go to the country.
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“On January 20th, as one of my many first Executive Orders, I will sign all necessary documents to charge Mexico and Canada a 25% Tariff on ALL products coming into the United States, and its ridiculous Open Borders,” Mr Trump said.
He also spoke against an influx of illegal immigrants heading into the country.
While migrant arrests reached a record high during President Joe Biden’s administration, illegal crossings fell dramatically this year as new border restrictions were introduced and Mexico stepped up enforcement.
Mr Trump added: “Both Mexico and Canada have the absolute right and power to easily solve this long simmering problem. We hereby demand that they use this power… and until such time that they do, it is time for them to pay a very big price!”
After issuing his tariff threat, Mr Trump spoke with Canadian Prime Minister Justin Trudeau and they were said to have discussed trade and border security.
“It was a good discussion and they will stay in touch,” a Canadian source said.
Turning to China, the president-elect said he “had many talks with China about the massive amounts of drugs, in particular Fentanyl, being sent into the United States – But to no avail”.
“Until such time as they stop, we will be charging China an additional 10% Tariff, above any additional Tariffs, on all of their many products coming into the United States of America,” he wrote.
The Chinese Embassy in Washington said there would be losers on all sides if there is a trade war.
“China-US economic and trade cooperation is mutually beneficial in nature,” embassy spokesman Liu Pengyu posted on X. “No one will win a trade war or a tariff war.”
It is not clear if Mr Trump will actually go through with the threats.
He won the recent election in part due to voter frustration over inflation and high prices.
Mr Trump’s nominee for treasury secretary Scott Bessent – who if confirmed, would be one of a number of officials responsible for tariffs – has said previously that tariffs are a means of negotiation.
Conor McGregor has spoken out after losing a civil rape case as a feminist march was held in Dublin.
The MMA fighter was accused of raping Nikita Hand, who was awarded €248,603 (£206,000) in damages on Friday after a jury at Dublin’s High Court found McGregor assaulted her in a Dublin hotel in 2018.
Posting on social media, the 36-year-old said: “I know I made mistakes”.
It comes as hundreds of people in Dublin staged a demonstration in “utter solidarity” with Ms Hand.
Posting on X, McGregor said: “People want to hear from me, I needed time. I know I made mistakes. Six years ago, I should have never responded to her outreaches. I should have shut the party down. I should never have stepped out on the woman I love the most in the world. That’s all on me.
“As much as I regret it, everything that happened that night was consensual and all the witnesses present swore to that under oath. I have instructed my legal team to appeal the decision.
“I can’t go back and I will move forward. I am beyond grateful to my family, friends and supporters all over the world who have stayed by my side.
“That’s it. No more. Getting back to the gym- the fight game awaits!”
Speaking outside court after the decision, an emotional Ms Hand said the two-week-long civil case had been a “nightmare” but that “justice has been served”.
“It’s something that I’ll never forget for the rest of my life,” she added.
In Dublin on Monday night, a march in support of Ms Hand was organised by the socialist feminist movement group Rosa to mark the International Day for the Elimination of Violence against Women.
Participants chanted “stand with Nikita” and “no more fear, no more shaming, we reject your victim blaming” as they carried signs and banners through the capital’s streets.
Ruth Coppinger, a councillor and general election candidate, and Natasha O’Brien, who became a public figure after a soldier received a suspended sentence for assaulting her, both spoke at the event.
Ms Coppinger said Ms Hand was “an incredibly brave woman” and that she was watching the event via a live stream.
Ms O’Brien was cheered as she said she’d been “in awe” of Ms Hand’s courage and that Ireland had let out a collective “sigh of relief” after the jury found in Ms Hand’s favour.
McGregor was accused of having “brutally raped and battered” Ms Hand.
She was taken in an ambulance to the Rotunda Hospital the following day where the paramedic who assessed her told the court she had not seen “someone so bruised” in a long time.
Following eight days of evidence, and three days of closing speeches and the judge’s instructions to the jury, the jury of eight women and four men spent six hours and ten minutes deliberating before returning their verdict.
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.”