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The Titan, operated by OceanGate Expeditions, lost contact with its mother ship about 1 hour and 45 minutes into its dive to explore the Titanic’s wreckage – a trip the company offers starting at $250,000.

The vessel lost contact with its mother ship Sunday morning, about 1 hour and 45 minutes into the trip down to nearly 13,000 feet.

Titan has between 70 and 96 hours of life support, according to the US Coast Guard, which means less than a day of oxygen may be left on the vessel.