The five people on a submersible that disappeared during a dive to the wreck of the Titanic have about 40 hours of breathable air left, the US coast guard says.
United States and Canadian ships and planes are racing against time to find a missing submarine two days after it disappeared off the coast of southeastern Canada while taking tourists to explore the wreckage of the Titanic.
The US Coast Guard said a boat on the surface - the Polar Prince - lost contact with the submarine, called the Titan, about one hour and 45 minutes after it began diving toward the site of the Titanic's wreckage on Sunday morning.
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