18 - Even closer view of the way on in the Gypsum Sand Crawl. The camera is inside the hole for a better view. 09/23/06 - Yvonne Droms (Vonnycaver)

19 - 6:20 pm - It's time to leave. We still have to survey our way up to the Great Gallery through the big pile of Breakdown. Mark starts the survey. 09/23/06 - Yvonne Droms (Vonnycaver)

20 - On the way out, we checked out another lead, at the bottom of the Great Gallery Breakdown, near a Mud Lake. Mark squeezed backwards through this tight opening. Now he's widening it from the bottom up. 09/23/06 - Yvonne Droms (Vonnycaver)

21 - What a muddy place! 09/23/06 - Yvonne Droms (Vonnycaver)

22 - The hole is now bigger, which will make it easier to come out. Mark then goes off exploring for a bit. He finds a small breakdown chamber with a lead going down. It's late, so he comes back. 09/23/06 - Yvonne Droms (Vonnycaver)

23 - Mark tries to come out again. Not as easy as when gravity helped on the way down! After a struggle, he makes it out. 09/23/06 - Yvonne Droms (Vonnycaver)

24 - Bob Anderson climbs up through the breakdown at the bottom of the Great Gallery. 09/23/06 - Yvonne Droms (Vonnycaver)

25 - Bob admires some pretty desert roses on the gypsum-covered walls. 09/23/06 - Yvonne Droms (Vonnycaver)

26 - Close-up of the desert roses on the gypsum-covered east wall of the Great Gallery. 09/23/06 - Yvonne Droms (Vonnycaver)

27 - Yvonne surveys out the very steep route leading through the breakdown from the Gypsum Sand Crawl passage to the Great Gallery. It's 8:45 pm. We finished the survey at 11 pm, then exited Schoolhouse at 12:40 am after a 19.5-hour trip. (Mark Minton photo) 09/23/06 - Yvonne Droms (Vonnycaver)

5 am: Mark Minton, Gordon Brace, Dan Zinz, and Susan Posey getting ready to enter Schoolhouse Cave before the endangered bats return to the cave after their night forays. 9/16/06 - Yvonne Droms (Vonnycaver)

6 am: Mark Minton approaches the Nick of Time in Schoolhouse Cave. 9/16/06 - Yvonne Droms (Vonnycaver)