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And of course there're multiple displays, to get the information to the diver.

When the diver carries many diving cylinders, especially those made of steel, lack of buoyancy becomes a problem.

The BCD is used to compensate for the compression of a wet suit, and to compensate for the decrease of the diver's mass as the air from the cylinder is breathed away.

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So, a diver with a 3 litre oxygen cylinder filled to 200 bar who leaves 25 in reserve will be able to do a 450 minute 7.5 hour dive (3 L 200 bar 0.75 1).

Using the same type of equipment as scuba diving, the diver breathes from compressed air cylinders, which float on a free floating raft at the surface, allowing the diver only 20 30 feet (6 9 m) of depth to travel.

Open circuit The gas endurance of open circuit demand scuba depends on factors such as the capacity (volume of gas) in the diving cylinder, the depth of the dive and the breathing rate of the diver, which is dependent on exertion, fitness, physical size of the diver, and experience among other factors.

In technical diving, the diver may carry different equipment for different phases of the dive some breathing gas mixes may only be used at depth, such as trimix and others, such as pure oxygen, which only may be used during decompression stops in shallow water.