hundreds of survivalists and so-called ` preppers ' , of all ages and levels of ` experience ' , descended on the salt lake city , utah , suburb of sandy on friday for the first ever preppercon .
during the two-day expo , they were shown specially-equipped underground bunkers , learned new methods of storing food , tried out solar powered flashlights - and even dressed up as zombies .
they were also greeted by actors from the amc hit show ` the walking dead ' dress-up .