If a diver is at the surface moving jerkily, without their mask or regulator, what does this indicate?

The indication that a diver is moving jerkily at the surface without their mask or regulator suggests that they are showing signs of distress. When a diver is in a calm and controlled situation, movements would typically be smooth and coordinated. The absence of essential equipment, such as a mask and regulator, further emphasizes the severity of the situation.

In distress, a diver may struggle to maintain buoyancy or breathe adequately, resulting in erratic movements. This behavior signals that they may require immediate assistance. Recognizing these signs is crucial for other divers and surface support to provide the necessary help and ensure safety in the water. Understanding these distress signals is an important aspect of diver safety, as quick identification can prevent accidents and aid in rescue efforts.