This obviously isn't me, but this is the end of the weird "crawl on your side" segment of the first cave we went through, Skyscraper.
I'm still not sure how I made it through that twice; the picture is showing the easy part! There's one curve in that segment I hated because it tore my pants off once, and my kneepads the second time. I also disliked that you had to crawl up at an angle with no room to maneuver at one part, lest your helmet get stuck.