The United States Coast Guard is leading the hunt for Titan, a small vessel that went missing in the North Atlantic Ocean on Sunday. The Titanic crashed in this same remote location in 1912, killing over 1,500 people after colliding with an iceberg. Now, we have a strong understanding of what it is like for people confined inside the submarine, where time is running out, owing to earlier accounts of the Titan’s deep-sea activities.

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The passengers could be dealing with a decreasing 96-hour oxygen supply as well as getting colder and possibly developing hypothermia. There are no seats, either, and there is just one toilet, which is a small, discreet black box. All passengers must sit on the floor with their bare feet.

An expert diver who has dived to great depths to inspect the Titanic debris before worries that the Sunday disappearance of the submersible may have now succumbed to implosion thousands of feet below the surface of the ocean. According to G. Michael Harris, who claimed to possibly know three of the five people inside the missing sub, it is unlikely that they will be saved. “Worst situation is something happened to the hull and our fear is that it imploded at around 3,200 meters,” Harris said.

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In a statement, OceanGate Expeditions spokespeople Jim Wilkinson and Andrew Von Kerens told Newsweek, “For some time, we have been unable to establish communications with one of our submersible exploration vehicles which is currently visiting the wreck site of the Titanic. Our entire focus is on the wellbeing of the crew and every step possible is being taken to bring the five crew members back safely.”

“We are deeply grateful for the urgent and extensive assistance we are receiving from multiple government agencies and deep-sea companies as we seek to reestablish contact with the submersible. We pray for the safe return of the crew and passengers, and we will provide updates as they are available,” the statement added.

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British billionaire Hamish Harding, OceanGate CEO Stockton Rush, French explorer Paul-Henri Nargeolet, Pakistani businessman Shahzada Dawood, 48, and his 19-year-old son Sulaiman Dawood are among the five people reported to be on board the ship.