A sub that went missing while carrying five people to the wreckage of the Titanic has about 40 hours of breathable air left, the U.S. Coast Guard said Tuesday afternoon. The sub had about 96 hours of oxygen at most onboard, officials said.

A Canadian research vessel lost contact with the sub during a dive Sunday morning about 900 miles east of Cape Cod, Massachusetts, and U.S. and Canadian authorities have been searching for it.

Pakistani businessman Shahzada Dawood, his son Suleman, British explorer Hamish Harding and French explorer Paul-Henri Nargeolet were on the sub, CBS News has confirmed. BBC News confirmed Stockton Rush, the CEO of OceanGate Expeditions, the U.S.-based company that planned the voyage, was also on the vessel.

The Coast Guard said the last recorded communication from the sub was about an hour and 45 minutes into Sunday's dive.

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