CO2 level is somewhat unrealistic. There were numerous accounts that WWII submarines can stay submerged for a long time without significant CO2 issue. One Japanese submarine was able to stay underwater for 2 days before CO2 level reached 6%. A German submarine was chased and depth charged by a group of British destroyers for 36 hours. American subs are much bigger and roomier than German counterparts. In-game, you stay underwater for more than 12hrs then CO2 level can creep up to 10%. Feels a bit unrealistic.
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