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Did you know the deepest parts of the ocean are still largely unexplored? Courageous explorers risk their lives to go to these great ocean depths. Other explorers journey into deep volcanoes, caves, and mines. Who are they and why are they seeking...
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Contents
Deep, dark unknown -- Jacques Piccard and Donald Walsh -- Sylvia Earle -- Gennady Viktorovich Samokhin -- James Cameron -- Freysteinn Sigmundsson.