TIL that in 6BC the Greeks dug a tunnel over 1,000m long through a mountain by digging from both ends and meeting in the middle. Ingenious surveying and geometrical techniques were used to ensure the two tunnels didn’t miss. via /r/todayilearned


TIL that in 6BC the Greeks dug a tunnel over 1,000m long through a mountain by digging from both ends and meeting in the middle. Ingenious surveying and geometrical techniques were used to ensure the two tunnels didn’t miss.
http://ift.tt/1spD0g0

Submitted August 13, 2017 at 10:29AM by KE55
via reddit http://ift.tt/2fCo6T9

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