IN THEIR FIRST INTERVIEWS, EX-FEDS TELL "60 MINUTES" THE INSIDE STORY OF THE CAPTURE OF THE WORLD'S MOST WANTED MAN, DRUG LORD JOAQUIN "EL CHAPO" GUZMAN - SUNDAY

In his First 60 MINUTES Story, Bill Whitaker Explores the Tunnels the Mexican Kingpin Used to Elude Arrest, Accompanied by the Mexican Marines Who Captured Him.

Two ex-federal agents say they won the Super Bowl of drug enforcement when their joint effort with Mexican Marines led to the hideout of the world's most wanted man, Joaquin Guzman - AKA "el Chapo" - the infamous and elusive Mexican drug lord. In their first interviews, Derek Maltz, formerly of the DEA and Jim Dinkins, formerly of Homeland Security, tell Bill Whitaker the inside story of the fugitive's capture on 60 MINUTES Sunday, Oct. 12 (7:00-8:00 PM, ET/PT) on the CBS Television Network.

"In my world, it was like winning the Super Bowl," says Maltz, who was in charge of the DEA's Special Operations Division tasked with tracking Guzman down. After Osama bin Laden was killed, Guzman - called "el Chapo," Spanish for "Shorty" - was the most wanted man in the world. Maltz explains why. "Making billions of dollars, having a reach around the world in Asia, in Australia, in Africa, in Europe," says Maltz. "Putting poison on the streets, not just in the United States, but all over the world."

Dinkins, the former head of the Department of Homeland Security Investigations, says Guzman was a "monster" who ran the Sinaloa drug cartel like a corporation, even landing on the Forbes billionaires list. He ran it so well he managed to elude authorities for 13 years. "He employed some very sophisticated counterintelligence operations... if law enforcement was to get in close, they would never actually get to him," says Dinkins. Authorities were getting fed up. "The U.S. government and the Mexican government basically said, 'Enough is enough,'" Maltz tells Whitaker. Watch an excerpt.

Guzman often used tunnels to smuggle the drugs and also to escape capture. It took a joint effort to run him down, including technological knowhow from the Americans and on-the ground sleuthing from the Marines. "The Mexican Marines just were relentless. And they went from house through the tunnels, from tunnels to house from house," says Dinkins.

The marines finally caught up to him above ground, capturing him without a shot in a seaside resort. Dinkins and Maltz say the cooperation between their agencies and the Marines was the critical ingredient in getting the wily el Chapo. "You can't do a job against Chapo Guzman unless you're working together," says Maltz.

Whitaker, reporting his first story for 60 MINUTES, is the first American journalist to go down into the tunnels with the same Mexican Marines who had chased Guzman underground and finally apprehended him earlier this year.