the " el chapo" escape tunnel
the " el chapo" escape tunnel
(OP)
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 ?
RE: the " el chapo" escape tunnel
THAT ended in the Clinton administration. A decent quality GPS with SBAS/WAAS can routinely get down to 2.5 meters. Given the time required to dig the tunnel, they would have had multiple position fixes over that time. There are also algorithmic approaches that can get positioning accuracy better by using a fixed base station as a pseudo-reference; RTK GPS which farmers use can get down to centimeter accuracies, as can multi-band GPS using phase differencing.
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: the " el chapo" escape tunnel
RE: the " el chapo" escape tunnel
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: the " el chapo" escape tunnel
RE: the " el chapo" escape tunnel
Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik
RE: the " el chapo" escape tunnel
https://www.businessinsider.com/infographic-of-el-...
According to the article, the cartel spent $50M, not 5, so lots of money well spent
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: the " el chapo" escape tunnel
RE: the " el chapo" escape tunnel
One of them is here 18.54°N 42.52°E You can see some entrances, some are fake, and associated surface facilities.
https://geo-matching.com/content/the-use-of-lidar-...
http://www.riegl.com/uploads/tx_pxpriegldownloads/...
https://water-serv.com/map-lidar-mapping-of-prittl...
RE: the " el chapo" escape tunnel
RE: the " el chapo" escape tunnel
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm