The Oxygen is the compressed oxygen used to blow your ballast tanks in an emergency, it has now effect on CO2 buildup. As far as I know, there is no on/off setting for CO2 buildup.
This isn't a bug, its a feature, Nuclear boats won't come along for another 15-20 years, along with the associated CO2 scrubbing technology. Besides, who wants to crawl at submerged speed when you can get up to 19-21 knots surfaced.
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