The Cryosphere is fitted with Simulators. Operation of these is quite simple -
1. To run a program, obtain a crystal (available from station stores, or other sources), go to a simulator, and insert it into the slot.
2. To end the program, either complete some program-specific end condition, or die, or run the "endprogram" command.
All combat, healing, death and loss of equipment inside a simulator is "virtual", In the event of a death, it will just end the program and if you get injured the injury will vanish when you end the program. Any equipment you lose or use up whilst in a simulation will be returned to you when the simlation ends.