Thread hasn't been active in a little while, but I thought I'd post some (unedited) shots I took a couple weeks ago of one of the cooler drains in town.
I just used my old point and shoot for these ones; I need to head back with the DSLR and tripod to get some nice long exposures.
The main tunnel (about 7 feet tall).
Cool junction at the end of an "offshoot" tunnel.
Looking back from the junction.