The Lee Tunnel is part of the Thames Tideway project, which aims to deal with London's sewage problem, especially in times of high rainfall. It has the prestigious title of deepest tunnel in London being as it is over 80 metres below the surface. It runs 4 miles from Abbey mills pumping station to the Beckton sewage treatment works.
As tunnels go, it’s pretty featureless. there are no other shafts along its route, it is simply a 4 mile pretty straight tunnel. The shafts were pretty cool as they have staging either side which, when the tunnel is in use, will steady the flow of sewage into the tunnel.
Looking up the shafts gives you an idea of how deep you are underground. 80 metres is roughly a 25 story building. We actually rode the box hoist down here, there are no stairs. The tunnel isn’t designed for human habitation after it’s completion so there’s no need for them.
It was quite nice to see this before it’s completion. A couple of months after we visited the box hoist was removed and the shafts capped so no more access underground here.