My cave diving buddy Limeyx came up from LA for a trip over to Eastern WA to actually try to dive in one of the flooded mines of the Conconully district. We managed to get in there and dive, but water clarity really limited what we were able to accomplish and see. So we didn't do alot of diving, maybe 350ft of horizontal flooded passages. There was definitely more there, but we made prudence the better part of valor and came home. Water temp was 38-39F. Here's a slide show with some video clips of the diving embedded.
http://www.vimeo.com/11960216
RJ
http://www.vimeo.com/11960216
RJ