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Humans are not equipped with gills so, at its most basic, dive equipment serves as a life-support system, enabling us to breathe underwater. To dive on any level, one must be comfortable with gear.

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Reference:
(Walter, Claire. Gear Talk. Scuba Diving: Everything you need to know to get started (and keep going). United States: Ragged Mountain Press, a division of The McGraw-Hill Companies, 2000.)