AndyF said:Don't know if it's there in dry weather.
The cave entrance is maybe 20m above the valley floor. When you go down the choke, you drop quite a way, my guess is that you are at about the valley floor level.
The valley contains a stream at some times, I'd guess the sump rises and falls in sympathy. It was certainly there three weeks ago.
I had a hike through Deep Dale in July 2005. Most of the dale was bone dry - the only wet bit was a pool of water which was seeping through from the dam near the quary. As for Thirst House Cave, I can recall the large entrance chamber where at the back it dropped through small boulders, and into a 2nd chamber. If I'm reading this right, people are suggesting the chamber 2nd that has water in? When I was there it was completely dry - just dried up mud. There was no sound of water. It looked like there had been some digging along time ago at the back of the chamber but I can't recall any obvious continuation of passage - admittedly I didn't have a close up look (as I needed to keep clean hehe). It looked like a really intriguing cave; and would like to go back for a proper look. Would love to know if it continued.
Also, further down the valley, located in a small cliff, well above the path and just above the scree runs I seem to recall another passage. My memorys gone somewhat vague, but I seem to remember thinking that it was possibly a mine. I think I had a quick look but didn't venture very far. Anyone know anything about this one?