This is a new biome that is supposed to depict the deep ocean. (irl)
Here the sky is a darker blue color and the ground is made of stone. There are trees made of blue blocks, which also have vines growing on them.
There are not a lot of creatures that spawn here, but there are spiders, cave spiders, drowned, normal animals, (so there is a meat source) evoker fangs, (the mouth spikes that evokers summon) and minecart chests (to depict buried treasure)
This biome is not meant for survival, but if you want to do a challenge of who can survive the longest, this is good for you.
I hope you enjoy this biome that I have created!