Sloppy engineering work. Scandalous!

Jesus. If anything like this happened in a South American country, there would be a lot of bashing here, But it happened in Japan and everybody is shocked :-)

@Danilo, all due respect, it is due to the fact that such things occur far less in countries like Japan, Germany etc than other parts of the world.

Regardless; what a screw up!

Unbelievable

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.

Indeed Arie. MAP THE UNDERGROUND PRECISELY!

I like the title: 'In Japan'. Sounds like 'only 'n Japan' however I know it cannot be the case.

Seems like the Japanese have got some like-minded in Toronto.

https://www.on-sitemag.com/construction/surface-construction-breaches-subway-tunnel-causing-major-ttc-delays/1003965695/

#TTC #sloppy #work

Ha ha. Also Japan.

Ha ha. Also Japan.

There is certainly a need for a centralized authority to map and grant any underground work. 

There is certainly a need for a centralized authority to map and grant any underground work. 

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