Titanic firm submersible missing.

[Jimbuna]

* A British billionaire is among five people on board a submersible tourist vessel which went missing during a voyage to the Titanic shipwreck

* The five-person OceanGate Expeditions vessel was reported overdue on Sunday evening about 435 miles south of St John’s, Newfoundland

* The U.S. Coast Guard said there was one pilot and four passengers on board and that the vessel had the capacity to be submerged for 96 hours

* British explorer Hamish Harding is among the passengers

* According to Sky News, French submersible pilot, Paul-Henry Nargeolet, and chief executive of OceanGate Expeditions, Stockton Rush, were also on board

* Pakistani businessman Shahzada Dawood and his son, Suleman, are the other passengers

* US and Canadian ships and planes have swarmed the area about 900 miles east of Cape Cod,

* OceanGate Expeditions said: "We are deeply thankful for the extensive assistance we have received from several government agencies."