It's arguable that the Dudley Tunnel is still navigable, but these days subsidence has taken its toll and only boats with a very low air draft, and those that are not driven by a diesel engine can pass this way. So for all practical purposes, it remains lost to everyday navigation.
I have therefore included a collection of archive photos of this underground network, with a particular emphasis on the Wrens Nest tunnel which has been completely blocked off and is now inaccessible.
Tunnel portal 1952
Castle Mill Basin
The above photos have been assembled from various sources, including those freely found on the internet. My thanks go to the many photographers alive and dead who have contributed to this collection and in so doing, are keeping the memory of these lost canals alive. These images are reproduced for ease of research are are not necessarily the property of this blog, and as such should not be used for commercial gain without the explicit permission of the owner (whoever that may be).