the terrain, the debris, the heat, the humidity all making it very tough on them but for the families of the loved ones, it has become an agonizing wait. nearly 200 searchers started just after day break scouring a rugged and remote stretch of the caddo and little missouri rivers. on foot it was a tough slog. >> hard to walk. a lot of debris. a lot of trees that are down. we're just having a pretty hard time walking and getting through. >> reporter: the dense overgrown underbrush made it dangerous to look for signs of life or anything else. >> that's why we have so many people here, so many different sets of eyes. maybe what one misses another will catch. >> reporter: other search eers, face temperature and humidity in the upper 90s. all-terrain vehicles, in