Apologies for regurgitating an old thread.
I haven't been on here for some time, and my interest in this tunnel has been rekindled, especially with new photographs and information. I plan to plot the tunnel path on Google Earth as accurately as i can, using the info on HG (Manholes covers / Fences etc) and my local knowledge, to complete this rather secretive historical "jigsaw", then making that .KMZ file available for others to view / edit.
I've attached what I've done so far, not much, so please feel free to make this a collective effort.
Thanks
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