(UPDATE) BOSTON, Massachusetts: Rescuers searching for a missing tourist submersible near the wreck of the Titanic have detected 'underwater noises' in the search area, the United States Coast Guard said on Wednesday, with oxygen for the five on board rapidly running out more than two days after they lost contact.

All communication was lost with the 21-foot (6.5-meter) craft during its descent on Sunday to see the remains of the British passenger liner, which sits more than 2 miles (nearly 4 kilometers) below the surface of the North Atlantic.