[msrenee]

Some sharks have to swim to move water over their gills. Not even close to all of them and it's not due to their heartbeat being connected to their swimming.

https://www.britannica.com/story/do-sharks-really-die-if-the...

[SonOfLilit]

Thanks. In my defense, I heard this from my diving instructor who is a marine biologist.

[msrenee]

It is a thing. It's just not as universal as people try to claim. There's a lot of biology in the marine world. No one can be an expert on all of it.