Waterdale is the small pond not far from philips hall thats always full of weed and also contains the top 3 sections of my pole!
Years ago, we used to make dens all round that area and not far from the pond we fouind an uner ground building – only way to describe it was a long corridor with similar sized rooms coming off it, bit like a prison or travelodge but with much lower ceilings. All sorts of equipment in there and as part of it had been demolished you had to climb through a tiny opening in the rubble – seroiusly unsafe looking back now. But I remember being told it was part of a hospital. Wonder if its still there now?