Back in 2007 it was possible to walk about a third of the way down the Coalport Tar Tunnel at Ironbridge. Bitumen oozes through the brick-lined walls, now there is a gas build-up in the tunnel that makes it too dangerous to enter.
- Aperture: ƒ/2.6
- Camera: PENTAX Optio S45
- Focal length: 5.8mm
- ISO: 200