The Diver whilst underwater has a
restricted ability to move as easily as he does in air. For example using a
hammer underwater the drag is over 800 times greater than the drag in air. The
added restriction provided by hoses, communication cables etc further reduce the
divers ability to perform with efficiency. Other restrictions such as the
visibility, the light concentration and the optical properties of water further
hamper the diver's ability. Cold water and limits on the bottom time make some
of the simpler operations difficult to perform. When designing tools
considerations are size , weight and shape. Switches and controls must be large
enough to be operated with gloved hands. The use of buoyancy aids and suction
cups and springs can help to overcome some of the restrictions. The
weightlessness which so eases the movement of the diver underwater now act
against the diver when he tries to exert pressure against the work piece..
Free swimming divers find small
reaction forces even harder when applying pressure.
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