AT SEA – (—-EDITORIAL USE ONLY â” MANDATORY CREDIT – ” OCEANGATE/ HANDOUT” – NO MARKETING NO ADVERTISING CAMPAIGNS – DISTRIBUTED AS A SERVICE TO CLIENTS—-) An undated photo shows tourist submersible belongs to OceanGate begins to descent at a sea. Search and rescue operations continue by US Coast Guard in Boston after a tourist submarine bound for the Titanic’s wreckage site went missing off the southeastern coast of Canada. (Photo by Ocean Gate / Handout/Anadolu Agency via Getty Images)