I've got a whole two
videos on Youtube, which you are welcome to watch
One is total darkness and follows my camera as it started recording in my pocket on a Swildon's trip, before making a bid for freedom, getting washed over the 20 and getting found several days later by Dangerous Dave, still working. This particular video is without doubt the finest piece of audio art (the only piece in fact) that I have ever created and is best listed to in total darkness, turned up to full volume, while doing you lockdown caving exercises outside during a torrential downpour.
The other is some fairly awful helmet-cam footage I took it Porth Y Ogof and put on Youtube to show my mother that cave diving was actually quite nice. She thought the fish were interesting, but was otherwise unconvinced
I have some footage somewhere of a browny-orange glow for about 15 minutes and the occasional bubbling noise. At one point a flake of muddy rock appeared for a second or two, but that video never made it to the internet I'm afraid...