character: Jacques Cousteau
topic: Ocean Explorer and Environmentalist
subject: Geography
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character: Sylvia Earle
topic: Marine Biologist and Oceanographer
subject: Geography
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character: Robert Ballard
topic: Researcher of Shipwrecks and Ocean Exploration
subject: Geography
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character: William Beebe
topic: Naturalist and Ornithologist known for deep-sea exploration
subject: Geography
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