Hello; back in the 1960's I explored caves with some older fellows. One was doing survey maps of area caves. There was one he wanted to survey but was a wet cave. So we waited till the dead of winter when the ground was frozen. We still had to go into water about belly button deep to get thru one area. We were stopped a bit later by the cave being totally submerged.Never go in a cave before rain, rule number one in my book
Being soaked in a cave at the low 50's F was not so much fun but coming out into temps in the low 20's F really gets your attention. The second most intense cold I have ever experienced.
I was along mostly as part of a buddy system. We never went into a cave alone. Three was the least we ever did.