As an international underwater diving signal, the OK gesture is used to communicate that there are no problems.
3.
One bell is not used as a diving signal as it is difficult to distinguish it from a jerk caused by temporarily snagging the line.
4.
In scuba diving, the thumbs-up gesture is a specific diving signal given underwater, in which the diver indicates that he or she is about to stop his or her dive and ascend.
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