Cryogenic suspension

Cryogenic suspension is a process where cells or whole tissues are preserved by cooling to low sub-zero temperatures. At these low temperatures, any biological activity, including the biochemical reactions that would lead to cell death, is effectively stopped. However, when cryoprotectant solutions are not used, the cells being preserved are often damaged due to freezing during the approach to low temperatures or warming to room temperature. Cryogenic suspension is often used in various science fiction media to allow human passengers the ability to survive long voyages through outer space. Examples of cryogenic suspension has been found in films such as Planet of the Apes and Aliens as well as television programs like Star Trek and Cleopatra 2525.