"Basil Jet" wrote:

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?

Considered necessary in the age of steam? (Or is there a secret race of
subterranean beings living there?)

The eastern side of the tunnel / bridge that carries Camberwell Grove was
suddenly closed to road traffic a few years ago after being found to be
structurally too weak, before eventually having a single lane reopen under
traffic light control.