A submersible vessel exploring the wreckage of the Titanic vanished Sunday off the coast of southeastern Canada, triggering a search effort in the North Atlantic for the five people on board who rescuers estimate have three to four days of life support available.
The Coast Guard began its search after the submersible lost contact with the Canadian research vessel Polar Prince during a dive that took place 900 miles east of Cape Cod on Sunday morning. The submersible was designed to hold 96 hours of emergency oxygen in the event of a calamity, Coast Guard Rear Adm. John Mauger said Monday at a news conference.