Drowned Dark
From Pixelmon Wiki
Drowned Dark is a Biome added by Pixelmon that generates in the Drowned World.
The Drowned Dark biome that is part of the Ocean Forge Biome Category. It is filled with water from bedrock to the build limit. The water and sky of the Drowned Crimson is a very dark black color and hundreds of soul particles constantly surround the player, suspended in the water. The underwater fog is very dense here, making it extremely difficult to see more than a few blocks. It is the coldest biome of the Drowned biomes.