to me climbing out of a sub at 500m deep is really unrealistic. there should be set backs such as take damage or lose o2 faster. if the pressure can crush a titanium sub why not me.
Do you not lose O2 faster the deeper you are? I haven't played in about a month and I've only ever played survival mode, but I'm pretty sure I remember my O2 usage rate increase the deeper I was.
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...wait, wiki says 2x at yellow, 5x at red... not sure which is the case.