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Breathing underwater with so much gear the acronym needed an acronym.

means A self-contained air supply that lets a diver breathe freely below the surface without tubes to the boat.

from Coined in 1952 from Self-Contained Underwater Breathing Apparatus — an acronym so beloved nobody remembers it is one.

Cousteau creditHe co-invented the Aqua-Lung, scuba's working ancestor.
Hidden acronymSelf-Contained Underwater Breathing Apparatus, spelled out fully.
Tank truthTanks hold compressed air, not pure oxygen.
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