TODAY | November 12, 2012
>> and devastated communities here in the northeast, but there's a growing movement of people preparing for something even bigger. nbc's janet shamlian introduces us to the doomsday preppers.
>> let's have a family meeting.
>> reporter: as a father of six braxton southwick wants to make sure his family is safe at his home near salt lake city and takes his safety very seriously. for nearly a decade the family has been preparing for a biological terror attack .
>> boys, i want you to get your guns.
>> reporter: they have regular drills to make sure they know exactly what to do if disaster strikes.
>> i want it fast. you guys ready?
>> let's do it.
>> grab the charcoal.
>> reporter: inside the southwick home more than a dozen guns, chemical suit, masks, hundreds of gals of water, gas and diesel fuel and enough food and supplies to last a year.
>> this is doomsday preppers.
>> reporter: southwicks are part of a new season of "doomsday preppers" on the national geographic channel .
>> a lot of people think if you're a prepper you're crazy, and it's just not true. there's so many families like us.
>> just like going up an attic except going down, it's in reverse.
>> reporter: so many families. ron hubbard is able to make a living selling underground disaster cellars also known as doomsday punkers. there's a lot of secrecy in the punker business. i can't even tell you where this one is except to say it's somewhere deep in the heart of texas .
>> the shelt worry add about $500 to the cost of a new home.
>> reporter: a blast from the past when films like this encouraged americans to prepare for the worst. they are a lot pricier now, running anywhere from $10,000 to more than a million. this one is about the size of an 18-wheeler, has its own air filtration system and runs on batteries or a generator with enough power to last at least a week. some features aren't exactly necessity.
>> got a 46-inch big-screen tv, a leather couch that reclines so can i lay back and watch my football when i have my satellite dish on, got my refrigerator, microwave.
>> reporter: hubbard says business is booming with customers who want to be protected.
>> we'll definitely be better prepared to execute our game plan and be able to get through whatever gets thrown at us.
>> reporter: years of planning, insurance against the unknown. for "today," janet shamlian , nbc news, houston.
>> and "doomsday preppers" premiers tomorrow night on the national geographic