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Take a look at 'El Chapo' escape tunnels
01:06 - Source: CNN

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Tunnels have long been a mainstay of Joaquin "El Chapo" Guzman's operations

Experts say Guzman's underground hideaways helped him escape authorities

CNN  — 

A bathtub that lifts up and leads to an escape route. A mile-long tunnel that starts inside a prison cell. A secret passageway behind a mirror that connects to a city sewer system.

Throughout Joaquin “El Chapo” Guzman’s reign at the helm of one of Mexico’s most ruthless cartels, tunnels have been a mainstay of how the notorious drug kingpin hid out from authorities hot on his trail and built an empire that landed him on Forbes magazine’s list of the world’s richest moguls.

Here’s a look at some of Guzman’s recent underground hideaways:

2014: Behind the bathtub

Investigators suspected they were closing in on Guzman in 2014 when they discovered seven houses in Culiacan, Mexico, connected by secret tunnels that also tied in with the sewage system.

But finding him after they raided one of them was trickier than they thought.

“This particular house had bars on the windows. The front door was reinforced, and was so difficult to get in, it was like 10 minutes went by,” said Derek Maltz, who once led the Drug Enforcement Administration’s special operations division.

The time it took Mexican marines to get past the reinforced steel doors was enough to allow Guzman to escape. His route? A hidden hatch under a bathtub.

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Inside 'El Chapo's' safe house
02:20 - Source: CNN

The nearest safe house was 3 kilometers (almost 2 miles) away, but thanks to the network of tunnels, Guzman was able to slip out of sight once again.

A secret passageway led from one of "El Chapo" Guzman's homes into the sewer system in Culiacan, Mexico.

They nabbed him later in a beachside hideaway in Mazatlan, a resort city about 200 kilometers (125 miles) away.

2015: Prison break

But he wouldn’t remain behind bars for long. Just 14 months after Guzman landed in Mexico’s maximum-security Altiplano prison, he broke out in July 2015.

After Guzman’s getaway, authorities said they made a shocking find underground: a lighted and ventilated tunnel, replete with tracks and a modified motorcycle inside.

The tunnel, Mexican National Security Commissioner Monte Alejandro Rubido said, began with a 50 x 50 centimeter (20 x 20 inch) opening inside a shower in Guzman’s cell.

Guzman didn't have much space to slip out of his cell in the maximum-security Altiplano prison.

That opening, officials said, connected to a vertical passageway going about 10 meters (33 feet) underground.

A ladder leads down a hole to El Chapo's escape tunnel.

The passageway, outfitted with a ladder, led to a tunnel that was about 1.7 meters (5.5 feet) tall and more than 70 centimeters (28 inches) wide.

Inside the passageway, investigators found what Rubido described as an “adapted motorcycle on tracks that was likely used to remove dirt during the excavation and transport the tools for the dig.”

Authorities say there was a modified motorcycle on tracks inside the tunnel Joaquin "El Chapo" Guzman used to escape from a maximum-security prison.

In one respect, the tunnel was notably different from others Guzman’s Sinaloa cartel had built.

“It was arrow straight,” said Jim Dinkins, the former head of investigation for the U.S. Department of Homeland Security. It was a sign, Dinkins said, that a cartel known for building sophisticated tunnels to send drugs across the U.S.-Mexico border had tapped its best and brightest for help.

“Look – the boss, El Chapo, is in prison. You’re not going to bring in the B squad,” Dinkins said. “You’re going to bring in the A team, and you’re going to bring in your best tunnelers, you’re going to bring in your best engineer, and your best crew … with one objective: You get the boss out.”

One Mexican official estimated the tunnel took about a year to build, and that whoever built it took out about 350 truckloads worth of sand and dirt.

The passageway stretched for more than a mile and ended inside a half-built house. Crews started building the house in December 2014, then stopped a few months later, according to a farmer who lived nearby. The facade appeared to be finished around February or March, the farmer said, but workers kept moving dirt around the property for months – until the day before Guzman’s escape, when all of them were gone.

The tunel that el Chapo used to escape
Fomer ICE official: I'm not surprised 'El Chapo' escaped
02:39 - Source: CNN

2016: Slipping out of sight

By early 2016, Mexican authorities had once again homed in on Guzman’s trail. This time, they zeroed in on a simple white concrete compound in Los Mochis, a coastal city in Guzman’s home state of Sinaloa.

Dramatic video shows troops raiding the home, guns blazing.

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Video shows firefight during raid on El Chapo's hideout
02:49 - Source: CNN

But they didn’t catch Guzman there.

The Sinaloa cartel boss, authorities later discovered, had slipped into an escape hatch behind a mirror.

A tug on an escape hatch behind a mirror popped open a doorway to a secret tunnel in Los Mochis.

From there, he ran for about a half mile, popping up from a manhole cover in the middle of a street.

Police captured Guzman later that day. And since then, he’s been behind bars.

But investigators who’ve followed Guzman’s career say there’s no doubt there are other hideaways out there – and that the cartel boss could try to escape again.

“He is the tunnel king,” Dinkins said.

Chasing ‘El Chapo’: Prison breaks, hideaways and life on the lam

CNN’s Chris Cuomo, Michelle Rozsa, Nick Valencia, Elwyn Lopez, Brian Todd and Poppy Harlow and CNN en Español’s Rodrigo Aguiar contributed to this report.