swim fins, attach to a diver's feet for greater efficiency, tend/tender, to assist/member of diving team who assists the diver, territorial waters, waters under the jurisdiction of a nation or state, through-water communications, diving communication using acoustic audio signals, tidal volume, volume of air moved out of the lungs during a single respiratory cycle, topside, personnel on the surface supporting the diving operation, total lung capacity, total volume of air that can be held, toxic/toxicity, can cause harm or death, trachea, windpipe, turbid/turbidity, cloudy, opaque, twitch, short, sudden jerky movement.

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