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The harness holds the regulator and the air line in place, allowing the diver to swim unencumbered beneath the surface. [1] Full scuba gear, which includes a buoyancy compensator, weights, and cylinder, can weigh in excess of 27 kilograms (60 lb), [10] but this is not strictly comparable, as it would usually include a wetsuit for thermal ...
Surface-supplied divers may be more heavily weighted to facilitate underwater work, and may be unable to achieve neutral buoyancy, and rely on the diving stage, bell, umbilical, lifeline, shotline or jackstay for returning to the surface. Free divers may also use weights to counteract buoyancy of a wetsuit.
The total buoyancy loss of a wetsuit is proportional to the initial uncompressed volume. An average person has a surface area of about 2 m 2 , [ 14 ] so the uncompressed volume of a full one piece 6 mm thick wetsuit will be in the order of 1.75 x 0.006 = 0.0105 m 3 , or roughly 10 liters.
Neutral buoyancy occurs when an object's average density is equal to the density of the fluid in which it is immersed, resulting in the buoyant force balancing the force of gravity that would otherwise cause the object to sink (if the body's density is greater than the density of the fluid in which it is immersed) or rise (if it is less). An ...
A line guide is almost always present to prevent line from unwinding unintentionally, and there is usually a method of clipping the reel to the diver's harness when not in use. Reels may be made from a wide variety of materials, but near neutral buoyancy and resistance to impact damage are desirable features. Reels may also be open or closed.
The buoyancy compensator is used by ambient pressure divers using underwater breathing apparatus to adjust buoyancy underwater or at the surface within the range of slightly negative to slightly positive, to allow neutral buoyancy to be maintained throughout the depth range of the planned dive, and to compensate for changes in weight due to breathing gas consumption during the dive.
Increased buoyancy of the BCD and dive suit due to gas expansion could cause a runaway ascent so air is vented as the divers ascend to retain approximately neutral buoyancy. At the end of the dive the BC should contain only a small amount of gas to support the unused gas in the cylinders.
Use of a buoyancy compensator with sufficient volume to compensate for the suit buoyancy loss. [47] Use of a lifeline with a surface tender. Sufficient ballast weight ditchable to recover neutral buoyancy at depth. Use of a DSMB or surface marker buoy with sufficient volume to compensate for loss of buoyancy. [9] Drysuit blow-up [46]
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