While at a local swim spot with my friend, we heard an horrific story of a rescue from the day before - a woman who was known as a strong swimmer got her arm impaled on an old fishing hook. This story ends with a rescue on a SUP board, but for 45 minutes, this woman was in serious trouble.
Sometimes old fishing hooks are going to be in the water with our shared spaces, and there's not much that can be done.
This hook was for pike, an aggressive predator, so was a big hook enough to snag an adult. It had a wire tracer, so it couldn't be snapped or bitten through. It was underwater and caught around a mooring or a buoy.
So the lesson here is to take a whistle with you and a small knife if possible in your tow buoy.