laundrie is a person of interest in the death of his fiance 22-year-old gabby petito. searchers are using atvs and high water vehicles known in florida as swamp buggies as the terrain is rough and much under water and plenty of alligators of snakes. according to locals those are abundant. his parents say their son went for a hike last tuesday. here is the search commander yesterday. >> i tell you these guys, law enforcement partners are motivated and hungry to find brian laundrie and ambitious to partner with us. >> theoretically could somebody be camping and surviving for a week in these very rough conditions? well, local venice outdoorsman said one could with proper preparation and good skills. >> there is no real potable water. you would need to purify your water.