Tourist submersible missing on dive to Titanic wreck site

The Canadian and U.S. coast guards launched a rescue mission Monday after a submarine on a tourism expedition went missing on a dive to see the wreckage of the Titanic about 435 miles off the southeastern coast of Canada, and about 900 miles off Cape Cod. The vessel carries a four-day oxygen supply. OceanGate Expeditions, which operates the Titanic trips, said it was "mobilizing all options" to rescue the vessel, which has five people on board, including British billionaire Hamish Harding. The U.S. Coast Guard said the mother ship lost contact with the submersible Sunday about an hour and 45 minutes into its dive to the Titanic wreckage, in water 13,000 feet deep.