Panthalassa Mod (1.18.2, 1.6.5) is a mod that adds prehistoric aquatic animals to your world. It was inspired by Steve Alten’s “MEG” book series. Prepare to discover laboratory structures that contain portals to an underwater dimension. These dimensions are sealed off from the rest of the world for many years. You will need to use special vehicles in order to navigate this dimension. You can brave the depths by boarding a Manta Ray Submersible Vehicle or an Abyss Glider II. You might be able lure them to the Overworld and keep them there in amazing enclosures if you’re clever.
Panthalassa is meant to be a companion mod, adding optional content to your Minecraft world. This mod does not provide any practical, direct benefits. The benefits are more aesthetic than practical. These creatures can be captured and taken to the Overworld. Then, you can keep them in enclosures for bragging rights.