Revisit 1 year later to they Amazing guys at Williamson’s and their exploration and excavation (along with my photography thankfully!) have made really good progress!
http://www.williamsontunnels.com/
https://www.facebook.com/pages/Friends-of-Williamsons-Tunnels/204751736221882?fref=ts
You can start to see the finer details in the brickwork and the what were nooks and crannies and piles of earth starting to disappear and become spaces, more clues and definitely more questions as more and more is exposed!
