Titanic submersible missing: What we know about shipwreck-exploring vessel

A submersible carrying five people to see the remains of the Titanic at the bottom of the North Atlantic Ocean is still missing despite a massive search operation by United States and Canadian authorities.

The Titan submersible had been on its way to the famous wreckage, off the coast of St John's, Newfoundland, in Canada, when it lost contact with its support ship, leaving the people on board with only enough oxygen for three to four days.

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