The culvert had the same basic mushroom shape as Monument and afterwards I find it difficult to remember where one ends and the other begins.

Not long after entering the culvert you come to the most interesting section of the drain. What looks like a small overflow tunnel outfall rests in the sodium glow of the streetlights above and a grille overhead prevents yet more glassware entering the culvert. The ladder leads up to a door to the street above, where people can be seen milling about through the gap underneath.

Masticator ducks in and out of culverts, threading its way through the city. We got into the culvert and straight away side pipes beckoned further inspection, one home to a CSO chamber with the processing gear annoyingly up near the ceiling.

The infall stands proud and makes little effort to conceal itself, it's grille reduced to lying in the water creating a mini dam.

A culvert that travels under much of St Helens with a dirty big sewer overflow at one end.

A set of stairs drops down from a small dry RCP and joins after the outfall, the whole setup looking like a 'Y' from above.