"Basil Jet" wrote in message
...

http://www.bing.com/maps/?v=2&cp=skb...=b&form=LMLTCC

It looks like there are two air holes in the middle of the picture. Why
would such short tunnels have air holes?

You can (just) see them from Google Street View, best from east end, but
doesn't provide any explanation. Not the usual sort of shape for steam holes
I would have thought but of course they must be very short.

MaxB