What action should be taken if the team is attempting a complex circuit?

When approaching a complex circuit during a dive, ensuring that all divers have a sufficient air supply is crucial. This is particularly critical in cavern diving, where the environment can present unexpected challenges such as reduced visibility, increased physical exertion, or the need for extended time underwater while navigating intricate routes.

Having adequate air allows divers to respond to unforeseen circumstances, as getting lost or experiencing equipment issues can lead to increased air consumption. It also provides a safety buffer in case of emergencies, allowing time for problem-solving or delays without the added concern of running low on air. Adequate air supply is a fundamental safety protocol that ensures all team members can remain calm and focused during complex maneuvers, enhancing overall safety.

While confirming each diver's experience level, marking entrance and exit points, and maintaining constant communication are all important practices, they are secondary to the fundamental requirement of ensuring ample air supply for each diver. Without sufficient air, even the most experienced team can find themselves in a critically dangerous situation.