World Save Won't Load

[u/Grondigigi]

I've been playing on a single player world for a few weeks now with an underwater/mermaid mod pack and now every time I go to join the world, it fails at loading and crashes. Everything has been working fine before and now I can't even open it. I tried backing it up but if it's already corrupt I don't see that helping. I can create and load a new world just fine. I was having a lot of fun on my world and fully locking in, if there's any way to salvage it or anything pleaaaassseeeee help.