ABC News (NEW YORK) -- Rescuers racing against the clock to save the five people trapped in a tourist submersible nearly two miles deep in the Atlantic Ocean are facing major obstacles that could make saving the people onboard extremely difficult, according to a former Navy submarine commander. Retired Capt. David Marquet told ABC News on Monday that this type of rescue operation is complicated because there aren't nearby U.S. or Canadian underwater vessels that can go as deep as the Titanic wreckage, which sits 13,400 feet below the ocean's surface.

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