That photo has brang some memory's back! I used to go school around that area (a long time ago) the tunnel is very long as you go in you cant see the other end until you go in a fair bit and it is so dark you cant see anything, as kids we used to walk through that tunnel, climb over that exact gate that's in the picture and jump down its quite high and the first time I jumped down was the first time I was ever winded! Could not breath for a very long time (proberly 30 seconds!) What pictures can do, cheers