Trust me... as a cave diver myself (refer to my Avatar), that would never happen. Not for me, at least. When we do cave dives, we ensure that the cave is well scoped out in advance and lined properly. One of the very basic rules of cave diving is "Always keep a continuous line to open water This, so you can find your way back when it's time to turn back. We would already know where "Devil's U-Turn" is and how it works long before we entered it. And it it was way too tricky, we'd bypass it for a much safer route. Believe it or not, there is actually, a training cave (where newbie cave divers go to train) here in FL called "Devil's Den." Open water divers can also dive there as the entrance is big enough for them as well. But there are portions of it that are gated off with the infamous "grim reaper" sign attached to encourage you to stay out.
We would never (or should never) impose that kind of risk on ourselves and our families... if for no other reason than it also imposes the same risk to the rescue divers that have to come in behind us and recover the bodies. Perhaps an even greater risk. Not saying all cave divers are that "dedicated" to safety, but they should be.