This looked like a more promising target than it ended up being. Its in 142ffw, we only did 6mins of BT (about 50 x 20ft so one swim around) since its upside down. But the video still worked up to something fun and I think it gives a good idea of what diving in Lake Washington is about.
Small mystery barge in Lake WA on Vimeo
Small mystery barge in Lake WA on Vimeo