A submersible craft used to take people to see the wreck of the Titanic has gone missing in the Atlantic Ocean with its crew on board, sparking a major search and rescue operation.
Tour firm OceanGate, which runs $250,000-a-seat expeditions to the wreck, said it was exploring all options to get the crew back safely.
It said government agencies and deep sea firms were helping the operation.
The Titanic sank in 1912 and lies some 3,800m (12,500ft) beneath the waves.
The missing craft is believed to be OceanGate’s Titan submersible, a truck-sized sub that holds five people and usually dives with a four-day supply of oxygen.
It is not known when contact with the craft was lost.