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A bolt snap is a type of snap hook with a manually operated bolt action slide gate of medium security used to clip a light load to a ring, eye, loop or bight to temporarily secure or suspend an object. They are used for a wide variety of applications including dog leads and for clipping scuba equipment to the diving harness.
LED (light emitting diode) - are very durable, efficient and powerful. HID (high intensity discharge) - are extremely powerful and have a nearly white beam. On the downside, HIDs are very delicate and quite expensive. [7] A modern dive light usually has an output of at least about 100 lumens. Bright dive lights have values from about 2500 lumens.
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 ...
Siebe Gorman & Company Ltd was a British company that developed diving equipment and breathing equipment and worked on commercial diving and marine salvage projects. The company advertised itself as 'Submarine Engineers'.
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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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