besides osama bin laden. >> they said, no one will ever catch. him >> but him in this team did it in the most astonishing way. >> surprise you? >> i could not believe. it >> the american agent who helped capture el chapo comes out of the shadows. >> i did not know who we would be able to trust. >> exclusive details of this white-knuckle man hunt. >> we would jump out of the back of the helicopter, pure chaos. >> pictures seen here for the first time. secret drug dens, hidden escape rooms. >> it is like harry houdini. every single time we got close, the chopper would escape. >> it was beyond imagination. >> to catch the bad guy, you have to become the bad guy. >> you are inside this real life thriller. >> this is it. he is there. >> he is there. >> it was like living in a movie. >> hello, and welcome to dateline. he was the infamous king pin