CO2 Levels
What is the maximum acceptable level of carbon dioxide inside your boat before you need to surface?
I'm trying to push it to the very limits because I am now stuck in a hostile port, I'm trying to sneak out because there are destroyers and gunboats all around, thankfully they haven't detected me yet. They're on high alert because I just sunk 2 docked merchant ships.
CO2 levels are over 10% - been submerged for hours. The CO2 indicator in the top right corner is saying I need to surface ASAP.
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