The undersea consists of all which is below the ocean surface of Vendrith without clearly crossing into another Plane - which it is commonly believed happens if you go deep enough (eventually reaching Abbadon). The undersea is inhabited by various animal, as well as Aquatic people.
With the presence of aquatic civilisation, as well as various natural disasters (such as those of the silence), there also exist many underwater ruins across the world. Some ruins, such as those in the Celene, come from the floating island called Eyne crashing down into them and sinking to the sea floor.
