airraid

Explored on the 18/11/18, loads of tunnels I didn't go down so will be going back, Best to read up on that here :- The Grove Story - Project X The main air raid shelters built there in 1939 still remain, despite other bunkers and surface buildings disappearing in the 90's when the site was...

Does anyone know if this is anything special like a air raid bunker or just something that will just waste my time. Spotted since younger but thought nothing off it till now since I saw a video of one similar on YouTube? Advise would be appreciated.