hi, i am an ME retired and i have a question thats been bothering me for years. The narcos build a tunnel about a mile long to allow el chapo to escape from that mexican hi security prison. the accounts are that it wasn't a straight line... that they had to change direction twice and ended up 30 feet underneath his shower stall ... an area of about 1 sq meter.... tunneled straight up and got him out. fine... they had a lot of experience digging narco tunnels but how did they navigate that accurately underground ? reports are that they got him a GPS watch in his cell but that wouldn't get any data unless it could see the sky and even at that, unless it was military grade gps it was only good to a 20' diam .... they hit a 1 sq mt " dot" from a mile away while digging blind.... serious question.... how did they do that ?
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