Why is it important to check the oxygen supply before a dive?

Checking the oxygen supply before a dive is crucial as it ensures that there is an adequate amount for both the planned duration of the dive and any potential emergencies that may arise. Divers rely on a consistent and sufficient supply of oxygen to maintain safe breathing levels throughout the dive, and unexpected situations could require more oxygen than initially planned. This pre-dive check helps prevent hypoxia, a condition that occurs when the body doesn't receive enough oxygen, which can lead to serious health risks or even fatality underwater. Therefore, confirming the oxygen levels is a vital step in dive safety protocols.