Deep dark sea

the deep dark is the coolest overworld biome currently: the colors give an amazing vibe, and the warden introduces mobs that can use other senses than sight to find you soo why not give the ocean its deep dark counterpart? 

the world got deeper so now the oceans can be deeper as well. and just like in real life if you go too deep there are some interesting creatures that use different senses to catch prey. sounds familiar? So the biome could be almost pure black with shulk like plants lighting it up, the mobs would glow here- a great place for the glow squid to live ;) anyways why would you come here since there are no ancient cities?

there could be a higher spawn rate for shipwrecks? or even bigger shipwrecks? the new mobs would be a good reason to come depending on what they dropped? the plants could be helpful depending on what they do? 

So- there are so many opportunities with this biome and the oceans despite the aquatic update are still kinda bland of interesting biomes.