As a Dive Supervisor, why should one monitor the divers' remaining air supply?

Monitoring the divers' remaining air supply is crucial primarily to ensure the divers' safety. As divers descend, the air in their tanks depletes, and running out of air can lead to life-threatening situations, including difficulty in surfacing and the risk of drowning. Keeping a close watch on their air supply allows the dive supervisor to assess whether the divers have enough air to complete their dive safely and return to the surface. This practice aids in planning for ascending in a timely manner, conducting safety stops, and managing any emergency situations that may arise.

Diving time and air supply are interconnected, but the primary goal is to safeguard the divers. Equipment integrity and underwater photography, while relevant to diving, are secondary concerns in comparison to ensuring that each diver has sufficient air to operate safely underwater.