SESK: Stuff Everyone Should Know · sesk.info/scuba-hand-signal-down
What does a thumb down signal mean on a dive?
Descend.
- Descend ✔
- Out of air
- Problem
Why: A fist with the thumb pointing down means descend. Use it when everyone is ready to go down together.
Huh, didn't know that: Add your other hand flat, palm up, under the thumb, and it means come down to my level.
Why did the thumb go down? It wanted to get deeper into the conversation.
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References
Answer: Descend. A fist with the thumb pointing down means descend. Use it when everyone is ready to go down together.
- SSI: Basic Hand Signals Every Diver Needs to Know www.divessi.com/blog/basic-hand-signals-every-diver-needs-to-know-8837.html
With your hand in a fist and your thumb pointing downwards. When to use it: When everyone is ready to descend together
Checked 2026-10-12.
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