This is a drain that's risen in popularity since publicised in the last year. Mainly due to it's feeding drain, the Southern Low Level Interceptor, Clapham and Balham Extensions. Of the drains I've been in, this one felt quite claustrophobic, the sides come in very close, and the ceiling only a handful of centimetres above my head. For pretty much it's entire length it's also featureless, the odd side-exit breaking up the monotony. The lower end is largely unexplored, as it's tidal.

When walking upstream we came to two short tunnels, leading down from the Interceptor behind. It seemed odd to have such an arrangement, but if they produce brickwork as fine as aesthetically pleasing as this, who cares!

The tumbling bay from the interceptor merging channel above. The tops of two local sewers can be seen on the right, and the inceptor exit top on the left. Fibre optic cables lining the chamber.

A disengaged penstock, the weights lying below. A ladder on the left leads to a particularly poopy short passage and manhole exit. The Storm relief is seen through the penstock.

Stood at the mouth of the Clapham Extension branch of the low level interceptor #2, the whole chamber is seen. The local sewers seen entering midway up the channel, a build up of 'debris' on the left side. The back end is the exit pipe for the interceptor.

Looking upstream in the Clapham extension interceptor. A reverse of the above shot. The bricks here coming at all angles at the tunnel mouth. The air was particularly pungent around this part of the chamber.

Towards the exit pipe from the chamber, the floor dropped and narrowed at the base, the interceptor contents being speeded up. This was as far back as I could get without my camera tripod being sucked away. Local sewers on the left, the extentions at the back. Tumbling bay on the right.

The raised penstock of the Low Level Interceptor #2, as it continues it's path down to Crossness.

Pictures done, it was time to head off. GE063 had to prepare himself for a flight to Switzerland the next day, and more draining.