I have a friend who is an engineer with that company. I wonder what he will have to say about this.

Fixed for you!

I did send an email to him with the subject Hello Cowboy is this your work?

How to do accidentally flood a room with cement?

drilling a hole through a wall and not checking what's on the other side?
So you have friends at Vinci? interesting. I have worked with them a few times, gotta love Leighton Buzzard

I have had confirmation that it was my friends employer but not my friend. I have been told of various cock ups that he has found and experienced on sites.

Just had an update, My friend is currently at Moorgate and a different subsidiary is dealing with Victoria. He is in the clear.

Just another proof that it's better to be an above ground engineer than a geotech

How they used sugar to clean it up.
Chemistry is strange but occasionally awesome.

I wonder how many sachets they needed?

We use sugar offshore too.
If they get any cement unexpectedly back at surface after a cement job we throw either sugar or citric acid into the cuttings ditch/auger and active pit to stop it setting. A couple of 25kg sacks usually does the job.
(If it's water based mud it may take a lot more acid to prevent the high pH from the cement killingthe polymers. The worst trip I ever had off shore was when that happened at the end of a contract and we didn't have enough acid on board. The polymers burned off with the high pH and the drilling fluid turned to sludge.)

Big sachets.

I dunno, I know people for whome that's about one mug of tea's worth.

Yeah, we've used sugar as a RMX retarder.

Funnily enough, we're now part owned by a Vinci company.