Titanic sub: ‘We have to remain hopeful’, says US Coast Guard, as vessel thought to have less than 20 hours of oxygen left – live

Rescue team says every noise being tracked and analysed; ‘every possible effort’ being made to bring missing crew home, says Polar Prince co-owner

An oceanographer has told the BBC the underwater noises give hope that those on board are still alive.

“There are plenty of sound sources in the ocean, but it does give hope,” Simon Boxall, a senior lecturer in oceanography at the University of Southampton, told the World Service.

A Canadian military surveillance aircraft detected underwater noises as a massive search continued on Wednesday in a remote part of the North Atlantic for a submersible that vanished while taking five people down to the wreck of the Titanic.

A statement from the US Coast Guard did not elaborate on what rescuers believed the noises could be, though it offered a glimmer of hope for those lost abroad the Titan as estimates suggest as little as a day’s worth of oxygen could be left if the vessel is still functioning.

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Titanic sub search team still hearing underwater noises, says US Coast Guard

Sounds are ‘inconclusive’, says US Coast Guard captain, but focus of search relocated to that area

Search teams in the Atlantic trying to locate the missing Titan submersible said they were still hearing underwater “noises” on Wednesday, but added that the sounds were “inconclusive” and not confirmation the crew was still alive.

A US Coast Guard captain, Jamie Frederick, told a lunchtime briefing “several flights” of Canadian P3 aircraft had heard the noises, reported by several media outlets as “banging”, on Tuesday and Wednesday, and that the focus of the search was relocated to that area.

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Billionaires and the Titanic: the allure of extreme expeditions

The more adventurous of the world’s wealthiest take trips to the edge of space and Antarctica in their stride

The disappearance of the submersible en route to the wreck of the Titanic has highlighted the businesses that offer extreme expeditions – and their clienteles.

Among the five people on the missing Titan submersible are two billionaires – Hamish Harding, a 58-year-old businessman who made his fortune selling private jets and holds three Guinness world records for previous extremetrips, and the British-based Pakistani businessman Shahzada Dawood, 48, who is onboard with his 19-year-old son Suleman.

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Titanic sub: Joe Biden watching search closely as vessel’s oxygen supply dwindles – live

White House says US president is thinking of crew on missing vessel and their families as desperate search continues

No 10 has said the UK Foreign Office is in contact with the family of Hamish Harding, as the rescue operation for the tourist submersible off the coast of Canada continues.

The UK prime minister’s official spokesman said: “The FCDO are in contact with Hamish Harding’s family and the local authorities.

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Missing Titan sub’s air supply dwindling as search yields no results

Rescue teams race to find crew of the submersible Titan, which went missing during a dive to the wreck of the Titanic

US Coast Guard officials said on Tuesday afternoon that the crew of the submersible Titan, which went missing in the Atlantic during a dive to the wreck of the Titanic, had about 40 hours of breathable air remaining, if they are still alive.

Capt Jamie Frederick also told reporters at a media briefing that a massive sea and air search that began on Sunday night for the vessel and five men aboard, and which has so far covered 7,600 sq miles of a remote area of the ocean, had “not yielded any results”.

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