I came across this Underground Tunnel by chance on my last trip to London this month. It is one of the tunnels off the southbound platform of the Picadilly line at Waterloo Station. It made for an ideal base for a high key clinical and futuristic look with a fair amount of processing.

The picture was taken handheld with a Sony A700 with a Sigma 10-20mm lens at 10mm. 3 raw images 2EV spacing for HDR. I used ISO 1000 for a fast enough shutter speed. Outputted in Photomatix.
The minus 2 EV image was brought in as a new layer excluded with a layer mask and then brought back in just for the lights to control the highlights.

Most of the processing was done using Topaz simplify mono pencil sketch light. This was adjusted in the sliders to bring in more detail than the preset. The effect was applied in Photoshop on a duplicate layer with a mask which was used to partly remove the effect from the rails and the woman in the distance.
The picture was given more punch using a clarity effect using unsharp mask with settings of 77 amount and 77 radius.

Original Image

White Tunnel OriginalWhite Tunnel Original

After Processing

WhiteTunnel FinalWhite Tunnel after processing