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Touch signals
When the visibility reached near zero, light signals are no longer usable, and neither are hand signals. This may arise if in a silt-up situation.
Pressing the upper arm of the dive buddy repeatedly = "Attention, STOP!"
Find the fist of the dive buddy and insert your thumb from below into his/her fist = ascend / to the exit
Pressing the upper arm of the dive buddy forwards (repeatedly) = move forward
Pressing the upper arm of the dive buddy backwards (repeatedly) = move backwards