Don't know what the percentage level or hours remaining are but I have seldom run into a problem.
After a fairly long time underwater, the CO2 icon displays in the upper RH corner of the screen and the CO2 indicator bar on the lower bar begins to register...
After the first indication on the bar I have enough time to conduct an attack and sneak away
When the level gets close to the limit, a text warning shows, and surfacing becomes a priority.
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