A Letter From the Publisher: Aug. 11, 1986

The sea floor, an unimaginably hostile world of crushing pressure and utter darkness, remains one of the earth's last unexplored frontiers -- as well as a story that journalists cannot easily plumb. But that is changing. This week's cover story describes the adventurers and scientists -- they are sometimes one and the same -- who are using the latest mechanical marvels to delve into the oceans' secrets. TIME correspondents around the world interviewed dozens of these underwater experts, whose most fascinating discoveries have been of ships that came to grief over the centuries, from the mighty Titanic to the remnants of...

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