^ There are specific condition required, not just "trapped in Ice and lives forever until the ice melts".
All sort of chemical is injected, the capsule's inner workings is regulated according to the body's condition. This is done for years upon years of stasis sleep, and this is why 'AI controlled cyrostasis' is less effective than 'shift change cyrostasis' where half the crew sleep and half the crew working and maintaining the cyrostasis facility, we all knew that computers can be very unreliable...
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