Beyond the Underground
Beyond the Underground is an intriguing mod for MCBE that enhances the underground realm. If you feel that the beta version of Minecraft PE 1.17 still lacks content in its subterranean world, consider using the Beyond the Underground mod, which introduces a wealth of exciting features.
With the Beyond the Underground mod, Minecraft Bedrock will see a plethora of new additions, including caves, resources, and various mobs:

Caves that emit light can be discovered solely beneath mushroom biomes MCPE.


Slime Zombies
The author has introduced new types of food and resources in MCPE:


Luminite Ore
Make sure to enable experimental settings for the mod to function correctly. Enjoy your gaming experience!
The modification has introduced new content – limestone caves.

Scorpions that will inhabit them. By the way, they can be cooked and consumed.

Researchers are set to encounter a novel type of structure – a limestone dungeon.

Well, let’s talk about the limestone blocks themselves. They can be extracted and processed. Now, a bit about the modification settings. Version 1.18 is suitable only for beta versions. For the official release, you should select 1.17. Choosing the wrong package will simply cause the game to crash.
Added:
Soul Caves
Whisper Mob
Several structures – Soul Fortress and Castle
