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.

Foxdenton culvert takes the Wince Brook under a sewerage works.

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.

STD starts off with a long old stoop through Corrugated Metal Pipe.

A balancer between the A and B Outfall sewers with penstocks to enable throttling between pipes.