In a remote mountainside on the Norwegian tundra sits the doomsday vault," a backup against disaster -- manmade or otherwise. Inside lives the last hope should the unthinkable occur: a global seedbank that could be used to replant the world. It's a modern day Noah's Ark, in other words, full not of animals but of plantlife. The Svalbard "doomsday" Global Seed Vault [stores] a half-million seed varieties. The arctic permafrost offers natural freezing for the seeds, while additional cooling brings the temperatures down to minus 0.4 degrees Fahrenheit. Should disaster wipe out a species -- or in the case of a large-scale global crisis -- its stockers hope the seeds stored there could be used to restore life. The preciousness of the seeds there is also reflected in the inaccessible nature of the vault. Anyone seeking access to the seeds themselves will have to pass through four locked doors: the heavy steel entrance doors, a second door approximately 115 meters down the tunnel and finally the two keyed air-locked doors. Keys are coded to allow access to different levels of the facility. Not all keys unlock all doors.