Hi my names John, this is my first map that I have completed 100% it has a few ugly spots as most first maps do. All in all its a learning experience I would really enjoy pursuing level design as a career one day. I present dm_sew3rs I spent about one week off and on working on it for about two hours each night. I tried to keep it in the hl2 combine ambiance as well as add my own features.
enjoy

also if you would like to see were i got the idea from heres a link
to the picture. I tried to make a replica of it but textures were a limitation as well as the decals...
http://whatwedoissecret.org/madebyblog/wp-content/uploads/2007/09/japanese+sewers3.jpg