inspiration, breathing air in, expiration, breathing air out, intercommunication system, means of voice communication between diver and topside, life preserver, inflatable device that assists a diver to rise to the water's surface in an emergency, line-pull signal, communication through tugs and pulls on the diver's umbilical or other lines, manifold, a tube or pipe with several outlets to connect pipes to one another, master diver, diving team member who oversees the diving supervisor and provides expertise, monitor, to watch closely for a special purpose over time, moor, to hold a ship or boat with ropes or anchor, nasal cavity, respiratory system from the nose to the pharynx, neutralization, rendering military enemies ineffective, nitrogen narcosis, medical condition resulting in breathing nitrogen under high pressure, open-circuit SCUBA, self-contained underwater breathing apparatus.

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