Under what circumstances should a diver initiate a rescue?

A diver should initiate a rescue specifically when another diver is unresponsive or shows clear signs of distress. This is a critical scenario where immediate action is necessary to prevent further harm or potential drowning. Recognizing signs of distress, such as inability to surface, panic, or an unresponsive state, indicates that the diver may require immediate assistance.

Rescue situations are time-sensitive, and understanding when to act can significantly impact the outcome. Training emphasizes the importance of being vigilant and aware of fellow divers' well-being, as quick recognition and response can save lives.

The other circumstances presented, such as having left the surface, completing a dive, or wanting to practice skills, do not provide legitimate reasons to initiate a rescue. These scenarios do not imply that another diver is in distress, and in fact, waiting until a dive is completed or for practice may lead to unnecessary delays in providing essential help.