All five people aboard a missing submersible known as Titan are believed to be dead, the company that operated the submersible said on Thursday. The crew went missing June 18 shortly after venturing into the deep sea to tour the Titanic wreckage site. “We now believe that our CEO Stockton Rush, Shahzada Dawood and his son Suleman Dawood, Hamish Harding, and Paul-Henri Nargeolet, have sadly been lost,” OceanGate Expeditions confirmed in a statement.