A massive search and rescue effort is underway in the North Atlantic after a submersible exploring the wreck of the Titanic went missing on Sunday.

The research vessel Polar Prince lost contact with the crew of the Titan sub an hour and 45 minutes into its dive. The US Coast Guard estimated the sub had between 70 and 96 hours of emergency oxygen on Monday at 17:00 EST (22:00 BST).

Among the five people on board the Titan, three people so far have been confirmed Hamish Harding, a 58-year-old British businessman and explorer, and British businessman Shahzada Dawood and his son, Suleman Dawood.

Mr Harding first announced he was joining the team in June last year and said that the crew on the vessel includes "a couple of legendary explorers, some of which have done over 30 dives to the RMS Titanic since the 1980s".

Mr Harding is the chairman of Action Aviation, an international company which deals with sales and operations in the business aviation industry, based in Dubai, United Arab Emirates.

On Twitter, his firm said on Sunday that "the sub had a successful launch, and Hamish is currently diving".

In a statement on Tuesday, the Dawood family said: "Our son Shahzada Dawood and his son, Suleman, had embarked on a journey to visit the remnants of the Titanic in the Atlantic Ocean.

"As of now, contact has been lost with their submersible craft, and there is limited information available.

"We are very grateful for the concern being shown by our

colleagues and friends and would like to request everyone to pray for their safety while granting the family privacy at this time." French explorer Paul-Henry Nargeolet is also thought to be on board, according to a Facebook post by Mr Harding before the dive started.

And Stockton Rush, chief executive of OceanGate - the firm behind the dive - is also being widely reported to be on the vessel.

Here is what we know so far...

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The clock is ticking and it's less than 2 hours to go until the team runs out of Oxygen will the team survive?

Titanic

The submersible exploded with the crew members in it https://youtube.com/live/b_qKshp-T8A?feature=share9