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In Japan: Train running in a tunnel hits a geological survey drill that pierced through the ceiling of the tunnel
A high-speed train passing through a tunnel in Japan comes in contact with a geological survey drill. Only a coincidence of drills lining prevents a disaster
This is another proof that there are problems with the mapping of the underground structures. It happens in every country. Even in developed nations like Japan.
I had once heard from a Russian tunneling specialist that while boring for the Moscow metro, the TBM hit a metal wall.They though maybe it was a gasoline tank or so. Very reluctantly they drilled a very small hole. Strangely all they got was fresh air. Then they cut a whole open just big enough for a person to squeeze to another side. The person who entered the whole was almost overrun by a train! It was a rail or metro tunnel I cannot recall now and because it was not correctly mapped, they almost pierced through it.
Can you see what may have happened if they bored through this metal wall via TBM and then the train hit them?
mapping mapping mapping! Very important.
Seems like the Japanese have got some like-minded in Toronto.
Not only in Japan. Also in Turkey:
(post in Turkish but in the comment section they placed English)
https://tunnelcontact.com/discussion/reply/view/54573/54571#elgg-object-54573
cover tunnel photo by: Matt Brown from London, England / CC BY
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Sloppy engineering work. Scandalous!