Watch: Titan Sub Implosion: Coast Guard Report Reveals Who Is at Fault for TragedyNew details have surfaced in the Titan submersible tragedy. Two years after the OceanGate Expedition vessel imploded with five passengers onboard, including its CEO Stockton Rush, the United States Coast Guard found the deep-sea exploration company was to blame for the "preventable tragedy," according to the report of investigation obtained by E! News.