well, i think the site you're referring to with the underground tank is this one,
http://www.dwpg.com/content.php?contid=3&artid=57
which i would love to do except i live in a condo (pretty sure the neighbors wouldn't think highly of me burying a tank in the front yard)
. anyway, i did find this from bladerunner's site, zerofanzone.com, so i'm not sure if it was orignally his work or not. hope this helps