The Mexican Army discovered on the Nogales border a tunnel under construction that connects with the United States, they arrested the seven involved
Hermosillo, Mexico, Jan. 29, 2012 .- Secretary of National Defense (SEDENA) reported that soldiers arrested seven people after discovering a narco tunnel under construction that would be used to cross into the United States at the Nogales Border.
Military Zone 45 specified that the excavation was made at a house located in a colonia in the centerof that city in North Sonora. It was mentioned that the tunnel was in construction and its dimensions are
1.3 meters high and is 35 meters long.
The passageway displayed that it was used for crossing the Sonora border into Arizona.
The operative cited that the military detained seven men and an automobile.
He commented that the military secured the 7 men, they were put ath the disposal of the authorities.
You'd think both the US and the Mexicans would use some sort of sonar to find anomalies in the earth to detect these tunnels. Some of these tunnels have been in operation for several years - no telling how many people they've shuttled across not to mention how much drugs in/money out.
Ground penetrating radar doesn't work well in hard soil, like the clay around TJ. It also isn't accurate for voids or detail beyond 5-7 meters, and one of the tunnels from the Tijuana airport to the warehouses on Otay Mesa was 20-30 meters BELOW GROUND LEVEL.
Apparently there's no proven method to detect tunnels, they just wait for intelligence and surveillance to plop the evidence in their lap.
Those that say, don't know. Those that know, don't say.