decompression sickness (DCS) - a general term for problems resulting from nitrogen leaving the body when ambient pressure is lowered, demand regulator - delivers the air to the diver in an open-circuit SCUBA system, demolition - the act of destroying, often with explosives, descend/descent - to go down; down to working depth, descent line - double-braid line used to pass tools and equipment between the diver and the surface, diffuse/diffusion - to spread or scatter; gas exchange throughout the body via the respiratory system, displacement - the act of moving water to make way for the volume of an object, dissolve - to break down in order to be mixed into a liquid, diving bell - a bell-shaped apparatus with the bottom open allowing divers to breathe for hours, diving dress - a complete outfit for deep-sea diving; full-body garment, boots, helmet, diving medical officer - diving team member responsible for defining the proper course of action during medical emergencies, diving supervisor - diving team member in charge of the actual diving operation,

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