Who is responsible for analyzing the contents of the stage cylinder?

The responsibility for analyzing the contents of the stage cylinder falls on the diver. This is crucial for ensuring their safety and planning for the dive accurately. Divers need to verify the gas mixture in their cylinders to ensure it matches the requirements of their dive profile, including depth and planned oxygen exposure. Analyzing the gas composition helps prevent inadvertent exposure to hazardous levels of oxygen or other gases, which could lead to serious diving accidents or health issues, such as oxygen toxicity or nitrogen narcosis.

While the dive master and support team play important roles in the overall safety and organization of a dive, the individual diver must take responsibility for their own equipment, including confirming the contents of their stage cylinder before the dive. Manufacturers are responsible for producing the cylinders but do not analyze the gas mixtures; that responsibility lies directly with the diver.