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then they had a power system which they would use for the pneumatic spade and for lighting. >> reporter: so this is the shred on regular mining tracks to move dirt oust 9 tunnel and drugs across the tunnel. they had gone 16700 feet, about six football fields all the way into mexico. the tunnelers weren't exactly on target as they dug. i take it, joe, they came up here thinking they were inside the warehouse and this is just outside the warehouse? >> you are absolutely, 100% correct. yes. >> reporter: how many times did they miss their target? >> that we can see, they missed it like about three times. >> reporter: digging through clay, the estimate, it took about nine months and up to $2 million to construct. they get one shipment through, it's worth it. you must assume that one of these tunnels is always at some