Ocean world generator

Full credits to dannytaylor, who created the datapack, and to judgealexander for the original idea. 

The photos show it alongside mods from the list; the datapack on its own does not generate any kind of island or any non vanilla structures.

Version for 1.21.1 (NEOFORGE ONLY) 

Minecraft's biomes are not removed or replaced: all of them, including the ones that would normally be terrestrial — such as plains, forests, desert, or jungle — still generate, just submerged now. This means structures associated with those biomes (villages, temples, pyramids, mansions, or ones from mods/other datapacks) also keep generating normally.

In addition, the seafloor of non-oceanic vanilla biomes is lightly enriched with underwater vegetation.

Compatibility - Important

This datapack has only been tested on NeoForge.

It doesn't depend on any mod, but the following are strongly recommended for a better experience:

MAIN

• Spawn
• Hybrid Aquatic
• Deeper Oceans
• NANGMAN DIVE - Ore NeoForged Unofficial
• NANGMAN DIVE - Ore Extension Datapack
• Aquamirae
• Ben's Sharks
• Ben's Sharks hybrid aquatic HOSTILE
• Structurify

It's designed to coexist with mods that add their own marine or terrestrial biomes and/or structures (tested with everything on the list above, and with many structure mods as well): since the datapack doesn't replace or block the Overworld's biome list, those mods can keep inserting their biomes and structures normally, without conflicts.

Notes

• Requires NeoForge 1.21.1 (untested on other loaders).
• Since it changes how terrain generates, it must be added before creating the world.

Version for 1.20.1:

I only changed a single number inside the datapack to make it compatible with Minecraft 1.20.1. To visit the original creator, click here.
I recommend using it together with structure and biome mods, since some of these will generate around the world, filling it with life instead of just an empty ocean.