aqualung

/ ˈækwəˌlʌŋ /

noun

breathing apparatus used by divers, etc, consisting of a mouthpiece attached to air cylinders strapped to the back

He was suddenly impatient to get going, to put on his aqualung and explore the reef from top to bottom.

They launched floats, placed aqualung mouthpieces on top of their masks, and swam parallel to the beach.

Replacing aqualung tubes with snorkels, they swam on the surface, faces down, alert for sharks.

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