Meet three American families who have drastically altered their lifestyles in order to survive what they fear will be the end of the world.

Meet an eclectic group of preppers, all of whom are taking extreme measures to ready themselves for the end of the world.

A single dirty bomb could cause massive chaos.

Meet another group of unique preppers who are readying themselves and their families for the end of the world.

Follow three New Yorkers as they plot their routes out of the city, literally escaping the grid to reach safety.

Brent from Florida lives in fear of an electromagnetic pulse (EMP) that will make the world go dark, leaving his family of 12 with nothing.

Meet Bryan Smith, who lives in rural Florida and fears a looming economic collapse will lead to violent social unrest. Also meet Christine, who is anxiously preparing for a mega tsunami that she fears will devastate the East Coast.

Not all preppers are relying on their nuclear family to survive the end of time; to some, creating a tight-knit community of like-minded individuals is the difference between death and survival.

Doomsday Preppers visits the household of Amanda Bobbin, who began prepping after being warned in her sleep of imminent danger.

Former firefighter medics John and Kelly are motorcycle riders living on a prepping homestead in the mountains of Virginia in preparation for a total economic collapse.

Prepping for an economic collapse, Jeff is converting a decommissioned missile silo into the perfect bug-out getaway.

Meet Craig, a proud Alaskan living in the woods of Fairbanks, fearing the collapse of the American economy. He's secretly built a bug-out dome, designed by friend and prepping partner Don.

Meet the Coy family, who live in the shadow of Mount St. Helens and prep for its eruption.

Meet a descendant from the Hatfield clan who fears that the current political and economic state will lead to world war.

A couple protect themselves against an economic collapse by stockpiling canned goods, weapons and supplies, but they still need an underground bunker. Elsewhere, a well-off family plan to hide out in Costa Rica.