The warning sign flashes at 10% . The CO2 gauge in the command room is red at 10% . It doesn't matter what anyone says . The game wants you to surface at 10% . Played for 6 years with no problems surfacing at 10% . You can increase time submerged by using the abilities (depending on mods) . If using the exe patcher there is a patch that makes CO2 increase when crew at battle stations .
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