There were five people on board the submarine when it went missing. British billionaire Hamish Harding was among the tourists on board. Prominent British-Pakistani businessman Shahzada Dawood was also on the submarine.
On Sunday they set out to see the wreck of the Titanic. Within two hours of the dive, contact with the craft was lost. When there were no signs of the submarine on Monday, the US Coast Guard began searching.
That search, led by the US Coast Guard, began on Monday. In addition to ships, underwater robots and submarines have also been used. France has sent a ship with a deep-sea robot that can descend to a depth of 6 km.
There was a glimmer of hope on Wednesday when a plane heard a knock. Emergency services hope the sounds will lead them in the direction of the vehicle.
These sounds, upon closer inspection, appear to have nothing to do with the Titan. “There appears to be no connection between the knocking sounds and the location of the wreck on the sea floor,” the Coast Guard said at the news conference.