I sunk a drift boat in Hells Half Mile on the Calawah river in 1989. The sides on my boat at the time were not as high as they should have been. The Class III+ drop toward the bottom end swallowed my bow and down she went.

A friend was behind me in a DB with higher sides and he made it through. He said the only remnant of me or my boat after I went under was my hat floating down the river. I swam/scrambled to the bank as he floated over me. The poly anchor line on my boat floated to the surface in the whitewater and my buddy grabbed it and tied it off to his, and then drug it to the side as the current velocity subsided. Some how I wound up with my fishing rod in hand. All my gear was in my vest which I wore and my boat was undamaged. Lucky.

Lesson: make sure your boat is made for the Class of water you're rowing.