This was a gigantic drainage pipe, more than big enough to comfortably walk in - if you don't forget your boots. We thought it would be try, so we had to awkwardly walk along the steep banked edges of the curved pipe, but we made it through dry. Our camera's didn't work too well in the dark, so we didn't get many pictures of the middle part, which even had a ladder than would let you emerge somewhere in the street.