How should a diver handle a free-flowing regulator while underwater?

When a diver experiences a free-flowing regulator underwater, the most effective way to handle the situation is to hold the regulator without sealing the mouth around the mouthpiece and "sip" the air as needed. This technique allows divers to continue receiving air while also preventing excessive air from escaping. By managing airflow this way, divers can maintain their air supply and stay calm, which is crucial for safe diving practices.

Holding the regulator loosely while sipping the air enables controlled breathing and helps the diver remain more stable in the water. This method also allows divers to maintain their position and control their buoyancy, which is critical in a free-flow situation.

In contrast, sealing the mouth around the mouthpiece may restrict airflow and exacerbate the situation, making it harder to breathe. Removing the regulator and ascending could lead to inhaling water or cause complications related to decompression. Trying to fix the regulator underwater could also be dangerous, as it might divert attention from maintaining safety and control in the water. Thus, handling a free-flowing regulator by "sipping" air is the best practice to ensure safety and effective breathing while managing the situation.