Journey to the bottom of the sea: On a Titanic tour

Tom Zaller, who runs the company behind "Titanic: The Exhibition," said touring the ship's resting place in a tiny submersible -- like the one that vanished Sunday in the North Atlantic -- was unforgettable, but frightening.

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This file picture taken on May 31, 2013 in Paris shows Paul-Henri Nargeolet, director of a deep ocean research project dedicated to the Titanic. (Photo by Joël SAGET / AFP)

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