I grew up next to Greenham Common Airbase as a nipper, and when the US military moved home it was announced to be common land, which as a 12 year old with nothing but a BMX and NWA on cassette walkman, it was lisence to be nosey. Just had a look on that 28 days later forum, they've put pics of the missile silo's up, my pal and I got into one down a 4ft by 4 ft air-vent, and ended up in a maze of tunnels, undergroung control rooms, long concrete corridors with 10" thick steel doors everywhere, torch batterys went flat when we were prob about 100 feet below the surface. that was a buzz, and I had to change my undercrakkas after haha.