Generally speaking, a top diver, compared to a novice, can only have an oxygen usage difference of about three times in extreme conditions.
A standard compressed air tank of about 200bar can be used by an OW-level novice diver for about half an hour, but under the same conditions, a top diving instructor can even use it for 90 minutes.
On this basis, Li Younan can double his oxygen usage, reaching an astonishing two and a half hours!
Chen Chong also knows very well that different levels of divers indeed have significant differences in their oxygen usage.
Firstly, in terms of breathing methods, the lower the breathing frequency, the less oxygen consumption.
And the neutral buoyancy control Li Younan just demonstrated, without any extra movements, made the oxygen consumption close to a resting state, which seems quite reasonable for such an oxygen consumption level.
