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2. Night diving - Wikipedia

   en.wikipedia.org/wiki/Night_diving

   A backup light can be useful if the primary light fails, [9] and is essential if doing a decompression dive without a dive computer which can be read in the dark. There are several advantages to night diving at a site that is familiar from diving there during the day. The diver who is more familiar with the site is less likely to be disoriented ...

3. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   A dive light is routinely used during night dives and cave dives, when there is little or no natural light, but also has a useful function during the day, as water absorbs the longer (red) wavelengths first then the yellow and green with increasing depth. By using artificial light, it is possible to view an object in full color at greater depths.

4. Surface marker buoy - Wikipedia

   en.wikipedia.org/wiki/Surface_marker_buoy

   This works well if searchers have a good light source. [1] Some types of buoy provide an attachment for a strobe light, cyalume stick or writing slate, which can convey signals to the surface support. Reflective tape may be used to make the buoy more visible at night. Length is usually from 1 to 2 metres (3.3 to 6.6 ft).

5. Diving equipment - Wikipedia

   en.wikipedia.org/wiki/Diving_equipment

   Rebreather diving, closed-circuit or semi-closed-circuit scuba; Freediving or breathhold diving, where the diver completes the dive on a single breath of air taken at the surface before the dive. Snorkelling allows breathing at the surface with the face submerged, and is used as an adjunct to free diving and scuba.

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7. Umbilical cable - Wikipedia

   en.wikipedia.org/wiki/Umbilical_cable

   For shallow water surface supply air diving, the diver's umbilical is typically a 3-part umbilical comprising a 3 ⁄ 8 inch (9.5 mm) bore breathing gas hose, 1 ⁄ 4 inch (6.4 mm) bore pneumofathometer ("pneumo") hose, and diver communications cable, which usually also serves as a lifeline strength member. The pneumo hose is open at the diver ...