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Demand / Command Signals

 
Demand (Command) signals are the few that require a return or repeat of the signal by another.  

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            Okay
This signal is most often used and one of the most recognized underwater hand signal.  With a light, in the dark, you do a circle to signal an okay.
Dayo Scuba, Orlando, Florida - Underwater Communications - Hand & Light Signals

      Hold, Freeze or Danger
Dayo Scuba, Orlando, Florida - Underwater Communications - Hand & Light Signals

Note, this hand signal is not uniformly considered a Demand or Command Hand Signal, but some technical agencies consider it one.

 

        End the Dive (or “Go Up”)
 Dayo Scuba, Orlando, Florida - Underwater Communications - Hand & Light Signals

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