Has anyone ever swam in a lake that had a strong undercurrent? I remember swimming in a lake when I was a kid in Germany, and they told us that it had a strong undercurrent, or undertow, and we should be careful. On one occasion that I was there, there happened to be some people playing ball in the water. They were actually in the water with their clothes on! One of the guys started yelling loudly, but since they all had been making a lot of noise earlier, no-one paid him much attention. The next thing I knew, they were making us get out of the lake, and they started "combing" it, so we knew that someone must have drowned. And, sure enough, it was the same guy who they eventually pulled out of there. He had been pulled in by the undercurrent. He was wearing a pair of pants with a heavy belt, and he also had had a broken arm with a cast on it. Most likely, these things didn't help matters when the current pulled him.