During the ascent after detecting bubbles from a lost diver, what should a diver do?

Following the bubbles down to the diver is the appropriate action during an ascent after detecting bubbles from a lost diver. This is based on the understanding that the bubbles indicate the presence of the diver, who may be in distress or needing assistance. By descending to the source of the bubbles, the diver can potentially locate and provide the necessary support to the lost individual.

This approach emphasizes the urgency of the situation, as the bubbles suggest that the diver may be in a critical moment and requires immediate attention. Tracking the bubbles allows for a more accurate retrieval, reducing the risk of further complications during the rescue operation.

In contrast, waiting on the surface could delay response efforts and may lead to worsening conditions for the diver in distress. Signaling for help at that moment might not be as effective as taking immediate action to assist the lost diver, while performing a head count doesn't address the immediate need for rescue. The key principle in emergency response is to act quickly and efficiently, making the decision to follow the bubbles a vital course of action.