Frantic search for missing Titanic tour sub continues.

A frantic search and rescue operation is underway for a small submersible, Titan, that disappeared on its way to the Titanic wreckage site in the North Atlantic. The sub, operated by OceanGate Expeditions, has five people on board, including at least three paying passengers. The U.S. Coast Guard is leading the search for the Titan about 900 miles east of Cape Cod and around 400 miles southeast of Canada's Newfoundland coast, where the sub started its dive on Sunday morning. Contact with the sub was lost about an hour and 45 minutes into its dive.