Who is on the Titanic sub? All five passengers on the Titan submersible that vanished during a mission to explore the Titanic wreckage were killed when the vessel endured a “catastophic implosion” deep in the ocean. British billionaire explorer Hamish Harding, UK citizens Shahzada Dawood and his 19-year-old son Suleman Dawood, French national Paul-Henri Nargeolet and OceanGate Expeditions chief executive Stockton Rush had “sadly been lost”, the company announced on 22 June – when debris from the sub was foud on the sea floor. The US Coast Guard offered its “deepest condolences” to the families after the tail cone of the vessel was found around 1,600ft from the bow of the Titanic wreck. There was a “catastrophic implosion” of the Titan’s pressure chamber, the expeditions company said.It added: “These men were true explorers who shared a distinct spirit of adventure, and a deep passion for exploring and protecting the world’s oceans. “Our hearts are with these five souls and every member of their families during this tragic time. “We grieve the loss of life and joy they brought to everyone they knew.” On 28 June, the US Coast Guard announced that a search had since recovered “presumed human remains” from the sea floor.