I found it not very punishable in
WOS to stay submerged even when i have 60% of CO2.
Its just draining morale a little but everything seems to be operational.
Morale raise back quickly after emerging, so theres no punishment for suffocate crew.
I just think at this level of CO2 they would be already unconscious.
I was submerged more that 24h with base u-boat.
Awesome modpack anyway..