Gambitt
Registered
If you really want to mess up your "insta-buddy" start doing the macarena underwater, and see what they do! 
Scuba Diving Signals
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fisheater
Contributor
hudson:
Actually, they mean "ascend" and "descend." They are words that are used in sentences. They are not sentences all by themselves. A thumb pointing up is part of a message to terminate a dive, but by itself does not necessarily mean the dive is over. It may be part of a sentence that says, "Ascend to 50 feet, we are too deep." The misconception that a thumb pointing up ends a dive has come about in recent years because of the expression "thumb a dive."
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