Web OceanGate called the Titan the only crewed submersible in the world that can take five people as deep as 4000 meters more than 13100 feet below the surface of the ocean. Coast Guard said on Thursday and offered its condolences to. Wikipedia Web Authorities have said the Titanic-touring submersible that went missing on Sunday suffered a catastrophic implosion killing all five people on board while descending to explore the wreckage. . It is the first privately-owned submersible with a claimed maximum depth of 4000 m 13000 ft 2 and the first completed crewed submersible with a hull constructed of titanium and carbon fiber composite materials. Web Tributes from grief-stricken relatives and friends have been pouring in after a catastrophic implosion killed all five passengers on board a Titanic-bound submersible at the bottom of the ocean. More debris and presumed human remains have been recovered from the Titan submersible the US.