This 15-story underground doomsday shelter for the 1% has luxury homes, guns, and armored trucks

When the apocalypse arrives, life goes on. That's the possibility some are preparing for, at least.

In 2008, Larry Hall purchased a retired missile silo (a vertical, underground structure made for the storage and launch of nuclear weapon-carrying missiles) for $300,000 and converted it into luxury apartments for people who worry about the end of the world and have cash to burn.

Fortified shelters, built to withstand catastrophic events from viral epidemic to nuclear war, seem to be experiencing a wave of interest in general.

Someday, the 1% may live out Armageddon in style at Hall's Survival Condo Project, which cost $20 million to build and accommodates about a dozen families. Complete with food stores, fisheries, gardens, and a pool, it could pass as a setting in the game "Fallout Shelter," wherein players oversee a community of post-apocalyptic residents in an underground vault.

Take a look inside one of the world's most extravagant doomsday shelters.