The five crew members on board the missing submersible Titan died in a “catastrophic implosion”, the US Coast Guard has confirmed.

Oceangate Expeditions CEO Stockton Rush, Pakistani businessman Shahzada Dawood and his son Suleman, British billionaire Hamish Harding, and French adventurer Paul-Henri Nargeolet were on board the Titan when it lost communications with a support ship less than two hours into a 4,000m dive to the Titanic shipwreck on Sunday.