You have more risks than just reg failure though. Losing your line, line snapping, floods, rockfall, silt bank collapse, getting physically stuck, just to name

You have more risks than just reg failure though. Losing your line, line snapping, floods, rockfall, silt bank collapse, getting physically stuck, just to name a few. Based on the number of cave divers and the number of cave diver deaths over the past few years I would say your odds of dying on a cave dive are far, far higher than driving home. I think if you believe that you are more at risk driving then you haven't assessed the risks accurately. I speak as an experienced caver with several cave diving friends.