Deep Warm Ocean

The Deep Warm Ocean is a biome in the Update Aquatic Update. Similar to warm ocean biomes, but without coral reefs nor sea pickles, and twice as deep. Because they are a deep ocean variant, they can generate ocean monuments, resulting in the spawning of guardians, elder guardians, prismarine, and sponges.Also,generates ruins and shipwrecks.The fauna is the same of the Warm Ocean:tropical fish,pufferfish,dolphin,drowned and squid. This biome does not naturally generate since Snapshot 18w08b, though it can be seen using Customized Superflat or Buffet world options.

In the Caves and cliffs update part 2 it will deleted 100% because with the new world generation,the warm oceans can generate with different hights and it cans generate in deep.

The other unused biome is the Mountain Edge biome and also is deleted in 1.18.