Accidental Recordist Gate

I accidentally recorded this sequence when i left my camcorder on while filming some drawing tutorials. My warehouse style studio is in the inner city at street level opening onto a street closure/park so you will hear some faint bird tweeting in the background. Near the beginning and end there is the sound of a large industrial sliding door and the loud clanging is a drop bolt on an external metal security grill gate. Wind blown chimes add to the scene. I only applied a very low level audio clean-up using adobe soundbooth cs3 to reduce hiss.