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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