When my kids were learning to swim, they loved the thrill of jumping from the edge of the pool into my waiting arms.
I cautioned them over and over that they should make sure I knew they were jumping before plunging in. If I wasn’t ready, they would go under.
Inevitably that would happen at least once with each child. I would always manage to grab them before the situation turned remotely serious, but they did not enjoy the surprise of floundering on their own.