Accessory equipment that is often useful in surface-supplied diving operations includes the following items:
■ Lead Line. The lead line is used to measure depth.
Descent Line. The descent line guides the diver to the bottom and is used to pass tools and equipment. A 3-inch double-braid line is recommended, to prevent twisting and to facilitate easy identification by the diver on the bottom. In
use, the end of the line may be fastened to a fixed underwater object, or it may be anchored with a weight heavy enough to withstand the current.
■ Circling Line. The circling line is attached to the bottom end of the descent line. It is used by the diver as a guide in searching and for relocating the descent line.
■ Stage. Constructed to carry one or more divers, the stage is used to put divers into the water and to bring them to the surface, especially when decompression stops must be made. The stage platform is made in an open grillwork pattern to reduce resistance from the water and may include seats. Guides for the descent line, several eyebolts for attaching tools, and steadying lines or weights are provided. The frames of the stages may be collapsible for easy storage. A safety shackle or screw-pin shackle seized with wire or with a cotter pin must be used to connect the stage to the lifting line when raising or lowering. Stages must be weight tested in accordance with PMS.
■ Stage Line. Used to raise and lower the stage, the stage line is to be 3-inch double braid, or 3/8-inch wire rope minimum, taken to a capstan or run off a winch and davit.
■ Diving Ladder. The diving ladder is used to enter the water from a vessel.
■ Weights. Cast iron or lead weights are used to weight the descent line. Tool Bag. The tool bag is used to carry tools.
■ Stopwatches. Stopwatches are used to time the total dive time, decompression stop time, travel time, etc.
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