could easily hide, authorities knew he couldn't run. >> the terrain certainly made a challenge but also helped us, because this isn't an area you can get across quickly. >> but authorities could move quickly in just 30 minutes after meeting with mark john, they found another clue. dimaggio's car, hidden under piles of brush. >> they're traveling slowly along this forest service road, and way off into the woods, he catches just a glimpse, just a split second, a red flash. and caught the reflective lens of a tail lamp. >> on saturday, august 10th, seven days after hannah went missing, the fbi assembled an army of specially trained agents. >> fbi sent people from three field offices and hostage rescue team from washington, d.c. u.s. marshals had resources. we sent homicide and child abuse investigators and some of our