From my understanding, crabs are in the game, thought from my POV only mods, not too sure about that. I was thinking how about adding Japanese King Crabs into the game. Basically giant, long legged crabs, found at the bottom of oceans, and can drop a large amount of food, however will pinch when provoked. Some other ideas could be underwater villages, basically villagers with special housing and skills that help them survive underwater, kind of like a modern day Atlantis. In addition to that, mythical sea creatures like Sirens (mermaid creatures that lure people in, but turn into demons when the prey is close), could be an awesome addition. Let me know if there are any more suggestions or improvements i can make on my ideas. Thanks!