It would be great if anyone of you could help me with this. I'm currently writing a fic where Sherlock ends up bound to a chair and left to die in a London sewer. Can anyone tell me whether these sewers still are connected directly with the Thames? So when the tide rises the sewer would fill and Sherlock would drown? Or does anyone of you know of a site where there's a kind of sewer 'floor plan' to be found? Wikipedia just sends me off scrambling in all directions.