Air Diving Supervisor Practice Exam

When encountering O2 loss at 30 feet without the availability of a chamber, it is crucial to calculate the remaining stop time using the air/O2 trading ratio. This calculation allows divers to determine how much time they can continue their dive safely while managing their breathing gas supply effectively.

In situaciones where oxygen supply is compromised, understanding how to optimize the remaining air supply is essential for diver safety. The air/O2 trading ratio involves assessing the current mix of the breathing gas and determining how long the remaining oxygen can sustain the dive while maintaining safe oxygen partial pressures. This ensures that divers can make informed decisions, such as whether to ascend or continue the dive under controlled conditions.

The other options, while relevant to diving safety and practices, do not directly pertain to a situation where immediate management of oxygen loss is required. Remaining dive depth and time spent on air for emergency procedures relate to situational awareness and planning but do not specifically address the pressing need to calculate safe limits in cases of O2 loss. Meanwhile, measuring oxygen levels in the water is not applicable in this scenario since the concern is with the oxygen supply in the diver's breathing mixture rather than the surrounding environment.