Coincidentally, I was reading about that maybe a week ago! It was mentioned on an archaeology show I was watching on YouTube (something by Minuminuteman, I think) and he briefly talked about it, so I looked it up. Absolutely fascinating. Something similar happened in the Straits of Gibraltar to form the Mediterranean, but long before modern humans.

https://en.wikipedia.org/wiki/Zanclean_flood

Edit: There was also the Bonneville Flood that was like the Missoula Floods, except it only happened once and was even more devastating.

https://en.wikipedia.org/wiki/Bonneville_flood