From my climbing cave..

This was my intended first recording project once i had received the Rode NT1 condenser mic i bought last week- recording traffic from the perspectives of a cave. It really gave some new perspectives on what i, on a daily basis, just consider a place for bouldering exercise.

Here is the link to it:
http://www.freesound.org/samplesViewSingle.php?id=79279

You will hear some complex mechanical sounds around 1:38.