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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