The US Coast Guard is conducting search and rescue operations for a small submarine that went missing in the Atlantic Ocean while exploring the wreckage of the Titanic. Despite hearing banging in the search area, no concrete signs of the submarine have been found. The submarine was designed to be submerged for 96 hours, and it is estimated that there are 23 hours of oxygen remaining. The search effort involves teams from the USA, Canada, and France, covering an area larger than the US state of Connecticut.
The submarine carried five people, including British billionaire Hamish Harding, French explorer Paul-Henry Nargeolet, and others whose identities have been confirmed by their families and companies.