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The signal to change from general to search signals or vice versa is seven pulls, and the meaning of the signals may vary depending on whether it is given by the diver or the tender. Most signals are acknowledged by returning the same signal, confirming that the signal was received correctly.
International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals . [ 1 ] Various navies have flag systems with additional flags and codes, and other flags are used in special uses, or have historical significance.
A diver down flag, or scuba flag, is a flag used on the water to indicate that there is a diver below. Two styles of flag are in use. Internationally, the code flag alfa/alpha, which is white and blue, is used to signal that the vessel has a diver down and other vessels should keep well clear at slow speed.
The divers start at opposite ends of the movable jackstay and swim along it, each diver holding the line with his left hand (or right, but both must use the same hand to keep them on opposite sides of the line) and searching the bottom visually or by feel on his side of the line until he passes the other diver and reaches the other fixed ...
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Calculation errors and wrong choices; Idea fixation; Overconfidence and sense of well-being; Laughter and loquacity which may be overcome by self-control; Anxiety (common in cold murky water) 6–8 50–70 165–230 Sleepiness, impaired judgment, confusion; Hallucinations; Severe delay in response to signals, instructions and other stimuli ...
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The procedures vary depending on whether the diver is using scuba or surface supplied equipment. Scuba divers control their own descent and ascent rate, while surface supplied divers may control their own ascents and descents, or be lowered and lifted by the surface team, either by their umbilical, or on a diving stage, or in a diving bell.