The Titanic submersible with five people onboard including British billionaire Hamish Harding is believed to be stuck 12,500 ft below in the wreckage of the original sunken Titanic.
Operated by OceanGate Expeditions, the tourism vessel was submerging with a crew of five including company CEO Stockton Rush, French explorer PH Nargeolet and Harding to the shipwreck site as part of a $250,000 tour, The Mirror reports.
They started at 4am yesterday but comms became disconnected mothership a short while afterwards. According to OceanGate's website, the sub can withstand 96 hours underwater with five people consuming oxygen.