Depth gauge
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Turtle (submersible)
Submersible
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Submarine warfare
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Intelligent Whale
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David Bushnell (inventor)
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New York and New Jersey campaign
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1776 in science
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List of lost United States submarines
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Turtle (disambiguation)
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Nautilus (1800 submarine)
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USS Holland (SS-1)
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Timeline of diving technology
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September 7
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American turtle
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