You could be taking a big risk if you take a swig of water in the Waterloo & City line depot.
The site used to be a chemical plant, and it seems that some of the chemicals might have, erm, lingered. In a recent test of the water, it tested positive for nine out of fifteen pollutants.
Yuk. No wonder it's known as 'The Drain'. It doesn't sound safe to work from to us.