umbilical - bundle of tubes serving a diver's diverse needs, Valsalva maneuver - process to force gas up the eustachian tube, vent/ventilate - allows gas to escape through an opening, ventilation - circulation and exchange of gases in the lungs, ventricle - lower chamber of the heart which takes blood from the atrium, vertigo - false sense of whirling, dizziness, loss of balance, vessel - a craft larger than a rowboat, vital capacity - the volume of air that can be expelled from the lungs, volatile - explosive, unstable, evaporating readily, watchstation diving officer - responsible for safely and successfully conducting the diving operation, weight belt - used to carry lead bars to create negative buoyancy, wet suit - most common form of protection; traps a thin layer of water next to the driver's skin, wreck - a ship which has been destroyed at sea,

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