What does the hand signal of either arm out, palm down, rotating in a circular motion request?

The hand signal of either arm out, palm down, rotating in a circular motion is commonly interpreted as a request for the assistance of additional swimmers. This action signals to others in the vicinity that the current swimmer requires support, emphasizing the need for more personnel to ensure safety and effectiveness in the operation. This gesture can be particularly important in situations where conditions are challenging, and the presence of additional trained rescuers can enhance coordination and response capabilities.

In the context of water rescues, clear communication is crucial, and this specific signal is widely recognized among trained personnel as a call for help from additional rescue swimmers, ensuring that operations can proceed with increased manpower when necessary.