I know no one ever reads over here but, just in case, this story is very interesting -- the whole history of the Sinola Cartel tunnel building enterprise
http://www.newyorker.com/magazine/2015/08/03/underworld-monte-reel
".... Within a few months, the cartel had its first supertunnel. It originated at a Sinaloa-owned house in Agua Prieta, a Mexican border town, and ended some three hundred feet away, at the warehouse in Douglas. At the house in Agua Prieta, the only way to access the tunnel was to turn on an outdoor water spigot; this triggered a hydraulic system that lifted up a billiard table in a game room on the ground floor, exposing a ladder to the tunnel....
U.S. law-enforcement agents learned about the tunnel from a confidential informant. In May, 1990, a team raided the house in Agua Prieta. In the game room, Terry Kirkpatrick, a customs agent, moved the billiard table and pulled back a rug, exposing a patch of concrete. He used a jackhammer to drill through the floor. Under the concrete was a subterranean chamber larger than the game room. Later, another agent happened to turn on the water spigot, causing the concrete slab to rise toward the ceiling as the agents looked on, stunned....
Two months after the tunnel was discovered, a group of Sinaloa suspects were detained. Two of them led Kirkpatrick and other agents about thirty miles outside of Agua Prieta and showed them a mass grave. Here, they said, were the diggers who had built the tunnel to Arizona...."
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"....Recently, agents raiding Sinaloa dig sites have found horizontal directional drilling machines, which oil and gas companies often use to build pipelines, and which can cost hundreds of thousands of dollars. Horizontal directional drilling requires less manual labor than traditional digging, and the machines bore smaller, shallower tunnels. If Sinaloa were to transition to a network of such pipelines, it could use air pressure to propel parcels of drugs under the border through pneumatic tubes....":
http://www.newyorker.com/magazine/2015/08/03/underworld-monte-reel
".... Within a few months, the cartel had its first supertunnel. It originated at a Sinaloa-owned house in Agua Prieta, a Mexican border town, and ended some three hundred feet away, at the warehouse in Douglas. At the house in Agua Prieta, the only way to access the tunnel was to turn on an outdoor water spigot; this triggered a hydraulic system that lifted up a billiard table in a game room on the ground floor, exposing a ladder to the tunnel....
U.S. law-enforcement agents learned about the tunnel from a confidential informant. In May, 1990, a team raided the house in Agua Prieta. In the game room, Terry Kirkpatrick, a customs agent, moved the billiard table and pulled back a rug, exposing a patch of concrete. He used a jackhammer to drill through the floor. Under the concrete was a subterranean chamber larger than the game room. Later, another agent happened to turn on the water spigot, causing the concrete slab to rise toward the ceiling as the agents looked on, stunned....
Two months after the tunnel was discovered, a group of Sinaloa suspects were detained. Two of them led Kirkpatrick and other agents about thirty miles outside of Agua Prieta and showed them a mass grave. Here, they said, were the diggers who had built the tunnel to Arizona...."
-----------------
"....Recently, agents raiding Sinaloa dig sites have found horizontal directional drilling machines, which oil and gas companies often use to build pipelines, and which can cost hundreds of thousands of dollars. Horizontal directional drilling requires less manual labor than traditional digging, and the machines bore smaller, shallower tunnels. If Sinaloa were to transition to a network of such pipelines, it could use air pressure to propel parcels of drugs under the border through pneumatic tubes....":
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