ABC News (NEW YORK) -- Nautical experts, the U.S. and Canadian navies and the U.S. Coast Guard are scrambling to get the necessary equipment and personnel to help locate the five people in the tour submersible that left Sunday to view the wreckage of the Titanic. But even with their specialized tech, search and rescue teams 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 are no U.

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