The whole reason my father was adamant about his kids learning to swim was his memory of Marine Corp training at age 17 getting tossed into the water and NOT knowing how to swim.
MIT...of all places, has a SWIM test you had to pass to graduate..or take a class if you couldn't pass. Apparently related to some Massachusetts law that was passed by a family of some college student who drowned because she didn't know how to swim. I passed but somehow they lost the result, not to mention that I taken a specialty swim stroke clinic. So I was told I wasn't going to graduate, wandered over to the pool a week or so before graduation swam a few laps, told them I wanted some kind of signed receipt this time, I didn't suffer through academic hell on earth to NOT graduate due to a....swim test, pretty sure my parents would not have been pleased as the hotel room was already booked for graduation.
Edit: Hmm, maybe not MA law, just some MIT thing although pretty sure the drowned person is the reason.
https://alum.mit.edu/slice/mits-wettest-test
more edits...apparently drowned person reason is a myth, whatever. A strange graduation requirement then, but, whatever, easier than multivariable calculus, at least for me, and that is also a graduation requirement even if you are a music major.