Coulsdon Deep Shelter, Surrey
Around the time of WW2 Surrey County Council commissioned the building of four deep shelters
Coulsdon Deep Shelter was the fourth and was built within the grounds of Cane Hill Lunatic Asylum
After the war, the shelter was purchased by Cox, Hargreaves and Thomson, Limited who specialised in the manufacture of optical devices – mainly lenses for huge telescopes
They purchased the tunnels as it provided the ideal atmosphere for the production of the lenses
However, the main drawback of the tunnels was the cold and damp conditions within them, this played havoc with corroding equipment and the morale of the workforce
To combat this, the company brought a refrigerator and wired it backwards so that it could act as a crude air-conditioning unit
Cox, Hargreaves and Thomson finally left the tunnels in the early 70s and the company subsequently wound up in 1978
After this they were used as a garage for a small length of time, but abandoned again because of the same problems faced by Cox, Hargreaves and Thomson
It was the later used as a dump for old VW car parts and the tunnels were then sealed by the local council
When this re-opened last year I missed out due to other arrangments and it had since been sealed
..More recently I went for a poke about here with Soylent Green only to find it welded up and a load of (fresh) concrete tipped over the entrance

As luck would have it, I was in the area again and was informed it was 'open for business' so myself Adders & Pom headed down one rainy afternoon for a mooch
It's in a bad way and not too many features left sadly compared to the likes of http://www.28dayslater.co.uk/forums/military-sites/80607-deepdene-ww2-southern-railway-traffic-control-centre-april-2013-a.html etc..
I attempted to grab a few shonky pics whilst Adders decided to take a derped out lawn mower for a spin

Still it was good to finally see first hand...