Trapped tourists ‘could bang on hull’ of missing Titanic sub to attract rescuers

Speaking to Sky News, Captain Marquet said if the crew is alive, they will be doing all they can to conserve their oxygen levels: “If they’re alive on the submarine they’re doing everything they can to extend that oxygen supply.

“They’re meditating, they’re napping, they’re not doing any excess movements. I’d probably have someone banging on the hull rhythmically every 15 minutes and see if that sound could transmit.”

The idea behind the banging is that the sound and vibration from the pounding could be picked up by nearby vehicles equipped with sonar which could guide them to the location of the submersible which has been missing since Sunday morning.

Captain Marquet added there were three things the crew should be doing to try and improve their situation.

He said: “You want to be doing the following three things. Number one, if you’re on the bottom figure out what’s broken so you get to the surface.

“Number two, if you can’t do that, in addition, make noise, use your transmitters, pingers, bang on the hull and then number three, extend your oxygen.

“You do that by remaining calm, reducing your metabolic activity, meditating and that will reduce the amount of oxygen you use and the amount of carbon dioxide poison that you put into this very small and confined space that is shared by five people.”

As each hour goes by, there are growing concerns that the operation may switch from a search and rescue to recovery.

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In their latest update, the coastguards looking for the missing have admitted that they might not be able to rescue them.

Captain Jamie Frederick, of the First Coast Guard District, said the search for the missing sub was “complex” and required “multiple agencies”.

He added that crews, both in the air, in, and under the water were searching an area of around 7,600 square miles, an area larger than the state of Connecticut.

Captain Frederick added that several aircraft and ships had been sent to the area, including one with a remotely operated vehicle (ROV) which can travel to the depths where the sub was last detected.

The captain added that the rescue mission was a “unique operation” and that if the ROV, currently on a mission to find the submersible, finds something they will work with experts to determine the “best course of action”.

There has been no communication with the sub known as Titan since it went missing on Sunday morning, one hour and 45 minutes into a dive.

Experts have put forward several reasons why the submersible might have disappeared.

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