Suspended Animation

Suspended animation is the process in which individuals slow down vital functions in living beings with low temperatures, stasis tanks or other methods for the purposes of preserving them and keeping them alive for extended periods of time.

Cryo-technology
Before the Great War, companies and government agencies produced cryo-technology. The Massachusetts Surgical Journal titled an issue "Cryo-Technology: Haven or Tomb?" Vault 0 kept pre-War geniuses in cryogenic stasis, by extracting their brains from their body and freezing them. They were then hooked up to the Calculator supercomputer, melding all of the identities of each connected brain into one. The vault also has a corresponding cryo lab to regulate these conditions.

Appearances
Suspended animation technology appears in Fallout 2, Fallout Tactics, Fallout 3, Fallout: New Vegas, Fallout 4, and Fallout 76.