sewage/sewer - solid and liquid waste, shackle - device to restrain movement, signal flare - bright light used in distress, sinus - air space within the skull connected to the nasal passage, slack - a portion of line that hangs loosely, snorkel - a tube used for breathing under water, sonar - system using transmitted and reflected underwater sound waves, squeeze - pain or discomfort in an enclosed space, stage - platform to put divers in and take them out of the water, standby diver - backup in case of emergency, submerge/submersible - cause to be underwater/able to be underwater,

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