Tunnel boring machine hits sewage line - GIFs

[mwmkravchenko]

"We were only off by 2 degrees (3 miles back)"

The terrible thing is that even less is most likely the cause. In downtown Ottawa they were boring a tunnel for light rail and they hit a water main. The news called it a cave in / sinkhole. I had friends that were involved in the fix. Every available cement truck was dumping into this hole for over a day. Guaranteed that the lump of cement cracked and overheated. To big to pour without cooling. But all they wanted was something solid to core a hole through.