The five Titanic tourists trapped in a missing submarine are led by Hamish Harding - the buccaneering British billionaire who has a Guinness world record for the longest duration spent at the bottom of the sea.
U.S. and Canadian ships and planes have swarmed the area about 900 miles east of Cape Cod, some dropping sonar buoys that can monitor to a depth of 13,000ft close to the Titanic.
Inside the sub, that can only be opened from the outside, are five men - some illustrious adventurers, others are amongst the richest in the world.
British billionaire adventurer Harding is on the submarine lost while diving to the Titanic. Four others were with him, visiting the cursed shipwreck lying in the Atlantic almost three miles underwater.
Paul-Henri Nargeolet, the French world-renowned explorer, is also on board. OceanGate CEO Stockton Rush is believed to be the the third crew member. Shahzada Dawood, 48, a UK-based board member of the Prince's Trust charity, and his son Sulaiman Dawood, 19, were on board the small underwater craft taking paying tourists to view the famous wreck. They are heirs to the great Dawood business dynasty and amongst the richest people in Pakistan - although they live in Surrey, England.