The missing Titanic submarine wreckage expedition carrying five people has been missing since Sunday after disappearing 370 miles off the Canadian coast.
The US Coast Guard confirmed it was searching for the missing vessel after the Canadian research ship MV Polar Prince lost contact with the submarine 900 miles east of Cape Cod, Massachusetts.
The submarine is said to have lost contact with its support ship an hour and 45 minutes into what normally takes a two-and-half-hour dive to the bottom, where the Titanic is located.
