Whitewater kayaking is the only extreme sport I've seriously tried so far that I outright quit. I learned how to sweep roll (when you are upside-down in a kayak and flip upright), I learned how to hand-roll, ran several class III rapids, surfed kayaks in the Atlantic hurricane swell, and I was working on a special recovery roll that I can't remember the name of when I decided to quit and never do it again. I've rappe…
One weekend she was doing training. The second day things went wrong. People fell out of the raft and had to be recovered. The raft flipped over twice. They were running late. At dusk they found their takeout under water. Half mile down the river in the dark on a sharp bend in the river a guy managed to grab a tree branch. A woman climbed over him and got a rope on it. They pulled themself to shore and tied off. Found a flat spot 40 feet up a steep embankment and spent the night. Daylight revealed a waterfall and cascade just around the bend.
She said she found out later about a dozen people died that weekend up and down the west coast. And she was done with rafting.
Another friend does canyoneering. Couple of years ago on a trip he missed, a friend was fording a river carrying a rope. Rope tangled him up on a submerged tree. He drowned with his friends watching from the rivers edge.