Tubers are idiots. Last week I was paddling Filter plant and I came upon a tuber, wearing only shorts(not even shoes), standing in waist deep water, on the far side of the river from the road, shivering such that he could hardly talk. I stopped to make sure that he was okay. He stated that he had broken his tailbone last year and had hit it on a rock again. He was at a loss for how he was going to rejoin his friends(that had floated down out of sight). I ended up ferrying him across on my back deck and pointed him towards the road. I explained to him how dangerous tubing can be at high flows (even on Filter Plant-someone dies in Mad Dog almost every year) and in cold temps. I don't think that it sank in.