I went caving once - yes ONCE :)
too damn cold - you see the caves are mostly wet - they have rivers running through them and I wasn't wearing a wet suit and it was November in Wales and was soaked to the skin wearing normal clothes.
This is the cave I went down
http://www.ukcaves.co.uk/cave-littleneath
some pics - can't believe I did this without a wetsuit.
http://www.phon.ucl.ac.uk/home/dave/personal/cave/littleneath.htm
One fairly lengthy section of the main route requires the caver to paddle in less than a metre of water with less than half a metre of airspace.
Yep remember that bit - it was a bitch
So at least one Bert went caving.