[demshateGod]

I have read before that the water was boiling but I don’t know how that allowed so many sea creatures to live. I guess the composition and temperature of the water would not be uniform across the globe and there could have been pockets of good water.

[null and void]

I guess the composition and temperature of the water would not be uniform across the globe and there could have been pockets of good water.

No it was uniform. That's why Noah wrote about how hot it got on the Ark after floating on a boiling sea for over seven months.

[editor-surveyor]

You can be sure that nothing in the sea lived; that was the purpose of the judgement.

There were no pockets of “good water.”