Yes, that’s right… cement!

Transport for London announced on their Twitter feed: “Apologies to customers inconvenienced by disruption to Victoria line services. We’re working to resolve the issue as soon as possible.”

TfL Victoria Line added: “Leak occurred as our contractors were working next to the signal control room. Our engineers are working hard to fix this.”

The closure, which affected the line between Warren Street and Brixton, was caused as contractors worked on an upgrade to the aging Victoria Station.

Water and cement accidentally leaked into the control room, damaging equipment, and it caused a failure of the signals on the southern section of the line.

It is hoped the line will return to full service tomorrow.

David Lammy MP for Tottenham tweeted: “Full Victoria Line service will hopefully resume tomorrow, although officials say it’s not set in stone…”

You can get live updates here.

Image credit: Getty