Missing Titanic submersible: the search effort explained

The search continues for missing Titanic tourist submersible.

Rescuers in a remote area of the Atlantic Ocean are in a race against time to find a tourist submersible that went missing during a dive to the wreck of the Titanic.

The vessel - named the Titan - lost contact with the surface around an hour and forty-five minutes into the expedition on Sunday. The US coast guard estimates the sub had up to four days of emergency oxygen.

Meanwhile, more details are emerging about the five people on board.

They include Pakistani businessman Shahzada Dawood and his teenage son Suleman, along with 58-year-old British adventurer Hamish Harding - here on the left - and a French deep sea explorer named Paul-Henri Nargeolet. Stockton Rush - the boss of OceanGate, which runs the trips - is also thought to be on the vessel.

OceanGate have been carrying out expeditions to the Titanic since 2021 - with passengers paying nearly 200,000 pounds for a place.

The ship - which sank in 1912 after hitting an iceberg on its maiden voyage - has been the subject of intense interest since its wreck was discovered in 1985.