UPDATE: 
Titanic submersible search: Banging noises heard

 

Searchers continued for a third day on Tuesday to look for a missing submersible craft that had been due to visit the wreckage of the Titanic.

Fears are growing for the five people aboard, as the vessel only had enough oxygen for up to 96 hours when it set out on Sunday morning.

On Tuesday, Jamie Frederick of the US Coast Guard said the vessel had "about 40 hours of breathable air" left. He added that the search operations so far "have not yielded any results."

Who was on board?

Prominent Pakistani businessman Shahzada Dawood and his son, Suleman, were on board the vessel in the North Atlantic, their family said in a statement. British billionaire Hamish Harding is also among the passengers, according to a social media post from a family member.

"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," the Dawood family's statement said.

Dawood is the vice chairman of one of the largest conglomerates in Pakistan, Engro Corporation, which has stakes in fertilizers, vehicle manufacturing, energy and digital technologies.

"As of now, contact has been lost with their submersible craft and there is limited information available," the statement continued.

"A rescue effort that is being jointly led by multiple government agencies and deep-sea companies is underway to reestablish contact with the submersible and bring them back safely."

Harding, a 58-year-old aviator, space tourist and chairman of Action Aviation, had posted Sunday on Instagram that he was proud to join OceanGate's Titanic mission.

"Due to the worst winter in Newfoundland in 40 years, this mission is likely to be the first and only manned mission to the Titanic in 2023," he wrote.

Harding also said that "the team on the sub has a couple of legendary explorers, some of which have done over 30 dives to the RMS Titanic since the 1980s."

OceanGate's founder and CEO Stockton Rush was also later confirmed by the company to be on board.

France said it was sending a deep-sea diving vessel to aid with the rescue search, with a government source saying that one of those on board was a French national — 77-year-old French explorer Paul-Henri Nargeolet.

The Atalante vessel, which is managed by the Ifremer research institute, comes equipped with an underwater robot that is able to operate at great depths.

Rescuing passengers a 'phenomenally difficult challenge' 

The rescue mission is a "phenomenally difficult challenge," said Simon Boxall, an academic in oceanography at the University of Southampton.

Speaking to DW on Tuesday, Boxall said part of the challenge is the long distance between the submersible and the nearest coast.

Boxall explained that rescue teams could either use a sound radar to sweep the seafloor in an effort to locate the submersible, or use cameras on unmanned vehicles. He said the latter was more feasible and therefore more likely.

"And, of course, once they've done that, they've still got the problem of how do they get it back to the surface. And, you know, this is fine if you've got months to do this. They've got two days to do this."

Boxall also addressed the challenges the rescue team might face with locating the submersible in a seabed saturated with the Titanic wreckage. 

Speculating over what might have happened to the submersible, Boxall said it was likely immobilized and has lost its power. He speculated as a result that the vessel got caught on some of the wreckage in the seabed, or some of the fishing nets drifting about.

"No one knows. And until they can actually locate it and see it, then we've got no idea what the next stage will be." 

What happened?

The 6.5-meter (21-foot) submersible named "Titan" began its dive on Sunday morning, according to authorities. 

The US Coast Guard tweeted that a boat on the surface — the Polar Prince — lost contact with the sub about one hour and 45 minutes after it began its descent toward the site of the Titanic's wreckage.

The Titanic is strewn across the seabed some 3,810 meters (12,500 feet) below the surface.

"It is a challenge to conduct a search in that remote area, but we are deploying all available assets to make sure that we can locate the craft and rescue the people on board," US Coast Guard Rear Admiral John Mauger told reporters in Boston on Monday.

But with no reported sightings of the vessel or communication signals on Monday, the US Coast Guard abandoned its missions before restarting on Tuesday. 

Titanic's location unknown for more than 70 years

Famously branded the "Unsinkable Ship," Titanic struck an iceberg shortly before midnight on April 14, 1912, and sunk below the surface less than three hours later.

Before reaching the seabed, the ship split in two, leaving the bow and the stern some 800 meters (2,600ft) apart, with the remainder of the Titanic strewn between.

More than 1,500 people died in the disaster, and the vessel remained undiscovered until 1985. Since then, numerous expeditions to the wreck have taken place, albeit with limited visibility due to its sheer size and remote position — some 400 nautical miles off the coast of Newfoundland, Canada.

jsi/nm (AFP, AP, Reuters, dpa)