Here's a link to a nice article on caving in Montana--Think Convention in 2018--and what the cavers have come up with.
http://www.greatfallstribune.com/story/ ... 655923001/
It includes cleaning up a cave that's pretty famous; the deepest cave in the U.S.--Which I wasn't aware of--and discussing the various treks to the Bob Marshall Wilderness area, where back in '69, it was advertised in the convention messages to come there and discover your own cave...which we did, but...you you young'uns wouldn't know about that.