That's the idea that when you die, you can have yourself frozen, and then, at some point when technology has advanced enough, you can be thawed out and repaired and revived and so resurrected.
Esa é a idea de que ao morrer, podes ser conxelado, e logo, no punto en que a tecnoloxía avance abondo, poderás ser desconxelado,  amañado e revivido e, polo tanto, resucitado.