hmm.. hypersleep is already part of game: you can choose the amount of crewmembers awake in the standard missions.
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Also allows the option of massive crew death from power failures to the stasis system.
what about failsafe systems? em-battery, auto-wakeup
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Allows the option of bringing additional needed crew out of stasis at the rapid expense of oxygen/water use/life support capacity...
sounds like a new mission: lifesupport failure - repair the crewquarters and lifesupport in short time (based on crewcount and max mission time) for mission success