The CO2 warning comes up at 10% but has no bearing on habitability. Once you get to 95% the game will take you down to 1x time compression. I would say once you get to that 95% you should surface because once you reach 100% its game over.
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USS Kentucky SSBN 737 (G)
Comms Div 2003-2006
Qualified 19 November 03
Yes I was really on a submarine.
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