Mexican drug trafficker Joaquin Guzman Loera aka 'el Chapo Guzman', is escorted by marines as he is presented to the press on February 22, 2014 in Mexico City.
'El Chapo' breaks out of prison through tunnel
02:05 - Source: CNN

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NEW: The tunnel used in the prison escape likely took about a year to build, Mexican official says

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

Authorities say the Sinaloa cartel kingpin used a tunnel to bust out of prison

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:

2015: Prison break

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.

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.

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.

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

Mexican President Enrique Peña Nieto said that’s something authorities are investigating.

Analysts say there’s little doubt that officials inside the prison were part of the plot.

“You cannot build a mile-long tunnel and get into this without some level of corruption,” said journalist Ioan Grillo, author of “El Narco: Inside Mexico’s Criminal Insurgency.”

el chapo prison escape tunnel sot _00004011.jpg
Official: 'El Chapo' escape tunnel had motorcycle track
02:49 - Source: CNN

One former drug smuggler told CNN on Sunday that it’s clear authorities weren’t looking for tunnels around the prison before Guzman got out – a sign they weren’t concerned about keeping the notorious drug lord in custody.

“Here’s a guy who time and again has proved he can build a hole in the ground,” said Brian O’Dea, a one-time smuggler who detailed his experiences in the drug trade in a 2009 memoir. “If they’re not looking at every single piece piece of soil around where they have that guy locked up, then they don’t have the willingness.”

Secret passageways to elude capture

After Guzman was captured last year, authorities said a key discovery marked a turning point in their investigation: seven houses in the Mexican city of Culiacan, connected by secret tunnels that also tied in with the city’s sewage system.

When authorities raided one of them, it turned out to be Guzman’s main residence in the town of Culiacan. The time it took Mexican marines to get past the house’s reinforced steel doors was enough to allow Guzman to escape via a hidden hatch under a bathtub, U.S. officials familiar with the search for Guzman told CNN last year.

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