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1650: Otto von Guericke built the first air pump
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Robert Fulton builds a submarine, the "Nautilus"
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Canadian inventors James Eliot and Alexander McAvity of Saint John, New Brunswick patent an "oxygen reservoir for divers", a device carried on the diver's back containing "a quantity of condensed oxygen gas or common atmospheric air proportionate to the depth of water and adequate to the time he is intended to remain below".[
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Minenschiff, the first self-propelled (locomotive) torpedo, developed by Robert Whitehead (to a design by Captain Luppis, Austrian Navy), is demonstrated for the imperial naval commission on December 21.
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First Sustainable underwater homes made.