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A frantic search is underway for a submersible that disappeared while on a $250,000-per-person dive carrying five tourists to view the historic Titanic shipwreck on Sunday. The 21-foot submarine, named the Titan, which was operated with a video game controller, carried the CEO of the company in charge and four passengers when it lost contact off the coast of Cape Cod. Would-be rescuers say they have not located the vessel. Passengers are subsisting on a 96-hour supply of oxygen that has depleted

"It could have snagged on an old fishing net on the seabed. It could have been on parts of the [Titanic] wreckage itself," professor Simon Boxall said.

The submersible is understood to have enough oxygen to last until midday Thursday - but it may already be unreachable, a naval veteran said.

Here is what we know so far about the missing 22ft long vessel and those on board, including the British billionaire adventurer Hamish Harding.

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