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2. Diver communications - Wikipedia

   en.wikipedia.org/wiki/Diver_communications

   The hand signal "OK" Diver communications are the methods used by divers to communicate with each other or with surface members of the dive team. In professional diving, diver communication is usually between a single working diver and the diving supervisor at the surface control point.

3. Thumb signal - Wikipedia

   en.wikipedia.org/wiki/Thumb_signal

   A thumb signal, usually described as a thumbs-up or thumbs-down, is a common hand gesture achieved by a closed fist held with the thumb extended upward or downward, respectively. The thumbs-up gesture is associated with positivity, approval, achievement, satisfaction and solidarity, while the thumbs-down gesture is associated with concern ...

4. Hand signals - Wikipedia

   en.wikipedia.org/wiki/Hand_signals

   Hand signals are agreed gestures that people make with their hands or body to communicate in a non-verbal way. When used in traffic, hand signals are often used to convey driver's intention of their next movement. In some countries, hand signals can apply to any vehicle whose signal lights are missing or damaged.

5. Glossary of underwater diving terminology: D–G - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_underwater...

   The person who administers a United States university's research diving safety program. [39] diving signals. Main article: Diver communications. Hand sign and light sign system used by scuba divers to communicate when underwater. diving stage. Also: "basket" See: Decompression practice#Diving stages and wet bells

6. Surface-supplied diving skills - Wikipedia

   en.wikipedia.org/wiki/Surface-supplied_diving_skills

   The bellman will normally stay in the bell and tend the working diver's umbilical, as well as monitoring communications with the diver, main supply and on-board gas pressures at the bell panel, and emergency signals if the voice communications system fails. The bellman will also signal the diver to return to the bell if voice communications or ...

7. Doing It Right (scuba diving) - Wikipedia

   en.wikipedia.org/wiki/Doing_It_Right_(scuba_diving)

   Communication is central to buddy and team diving. DIR divers must be competent at underwater communication by hand signals and light signals, and to use them to ensure that they are always aware of the status of the rest of the team. DIR divers have an extended range of hand signals, some particularly relevant to overhead and decompression diving.