The deadly Titan submersible disaster that raised global alarms about private deep-sea tourism was the result of preventable safety failures and deliberate efforts to avoid oversight, according to a U.S. Coast Guard report released Tuesday. All five people inside the Titan died in a catastrophic implosion as it descended to the wreck of the Titanic off Canada, and the dayslong search for the missing vessel grabbed international headlines. The Coast Guard convened its highest level of investigation in the aftermath. The Titan was owned by OceanGate, a private company based in Washington state. The operator of the submersible, OceanGate head...