Ah, it wasn't me added these latest photos, just noticed them on the site.
We used to cycle out there when we were at school. There's a series of short tunnels running out from an old quarry which now houses a sewerage works. 3 are easy to get to, the one with the steel door used to have old roofing tiles stored in it. The one with the farming equipment has a hole in the roof to surface which I always wondered about rigging up for some SRT practice.
The others are only accessible with some hacking through undergrowth and edging around a boggy or flooded area depending on the season, they don't go far, in fact you don't really need a light :lol: