The Lost Underground
Modpackby Legundo
Can you survive and never see the sun?
Type
Modpack
CurseForge Downloads
4,451
CurseForge ID
1186101
Last Updated
Apr 13, 2026
Description
I Survived 100 Days in the lost underground, and now you can too!
This is my latest multiverse adventure, a world of clashing dinosaurs, radioactive abominations, and... Unicorns and Candy?!?! Don't even get me started on the Sculk too... This Caves Only world is a nail biting adventure from beginning to end... and it ends with a BANG.
PLEASE NOTE
Due to the way this world generates (by default with the Lithospherical world type) - certain Alex's Caves structures will not generate. This includes the Primordial Volcano, Candy Cavity witche's tower, and the Abyssal Caves biome entirely. Due to this, some Alex's Caves bosses will be unavailable.
This modpack works entirely on it's own, but to download my specific map from the video, support me on Patreon!
https://patreon.com/Legundo
This modpack is as featured in my Hardcore 100 Days video!
Compatibility
Mod Loaders
Game Versions
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Contained Mods (155)
Just Enough Items (JEI)
View Items and Recipes
GeckoLib
A 3D animation library for entities, blocks, items, armor, and more!
Cloth Config API (Fabric/Forge/NeoForge)
Config Screen API for Minecraft
Architectury API
An intermediary api aimed to ease developing multiplatform mods.
Mouse Tweaks
Enhances inventory management by adding various functions to the mouse buttons.
AppleSkin
Adds some useful information about food/hunger to the HUD
Balm
Abstraction Layer for Multi-Loader Mods
Bookshelf
An open source library for other mods!
Curios API (Forge/NeoForge)
A flexible and expandable accessory/equipment API for users and developers.
Controlling
Adds a search bar to the Key-Bindings menu
Xaero's Minimap
Displays the nearby world terrain, players, mobs, entities in the corner of your screen. Lets you create waypoints which...
Clumps
Clumps XP orbs together to reduce lag
Xaero's World Map
Adds a fullscreen worldmap which shows you what you have explored in the world. Can work together with Xaero's Minimap.
Sophisticated Backpacks
Yet another backpack mod this time with backpack you can place in world, color in different color combinations, upgrade...
FerriteCore ((Neo)Forge)
Memory usage optimizations
Puzzles Lib
Why it's called Puzzles, you ask? That's the puzzle!
Cupboard
Cupboard provides code, frameworks, and utilities for minecraft mods
Searchables
Searchables is a library mod that adds helper methods that allow for searching and filtering elements based on component...
Enchantment Descriptions
Adds in-game descriptions for enchantments to tooltips.
Sophisticated Core
Library mod for Sophisticated mods
Farmer's Delight
A cozy expansion to farming and cooking!
Patchouli
Accessible, Data-Driven, Dependency-Free Documentation for Minecraft Modders and Pack Makers
Kotlin for Forge
Adds a Kotlin language loader and provides some optional utilities.
Nature's Compass
Nature's Compass is an item that allows you to locate biomes anywhere in the world.
Embeddium
A powerful, mod-friendly, FOSS client performance mod for NeoForge
Polymorph (Fabric/Forge/Quilt)
No more recipe conflicts! Adds an option to choose the crafting result if more than one is available.
Framework
A common library powering all of MrCrayfish's Mods
Carry On
Carry On allows you to pick up Tile Entities and Mobs and carry them around!
Create
Aesthetic Technology that empowers the Player
Oculus
Unofficial Fork of "Iris", made to work with FML
ShatterLib | OctoLib
Collection of shared code for Shatterbyte mods
Citadel
A Lightweight Library
Resourceful Config
Resourceful Config is a mod that allows for developers to make crossplatform configs
YUNG's API (Forge/NeoForge)
A library mod for YUNG's Minecraft mods
Packet Fixer
A simple mod to solve various problems with packets, NBTs and timeouts.
Alex's Mobs
85+ New mobs with stylistic quality above the default game.
YUNG's Better Mineshafts (Forge/NeoForge)
A long-awaited and much-needed abandoned mineshaft overhaul!
Artifacts
Adds various treasure items that can be found through exploration
Caelus API
A coremod and API to provide developers access to elytra flight mechanics through an entity attribute.
TerraBlender (Forge)
A library mod for adding biomes in a simple and compatible manner!
Server Performance - Smooth Chunk Save[Forge/Fabric]
Enables lag-free continuous chunk saving, increasing server TPS
Configured
Automatic in-game configuration menus for every mod!
NetherPortalFix
Ensures correct destinations when travelling back and forth through Nether Portals in Multiplayer.
Just Enough Resources (JER)
A JEI addon that adds mob drops, ore gen, ..
fix GPU memory leak[Forge/Fabric]
A mod that fixes memory leaks on the client
YUNG's Better Nether Fortresses (Forge/NeoForge)
A complete redesign of Minecraft's Nether fortresses!
Necronomicon API
A personal utility library, making development in both platforms easier.
Just Enough Professions (JEP)
A JEI addon that adds profession workstations
YUNG's Better Strongholds (Forge/NeoForge)
A complete redesign of Minecraft's strongholds
YUNG's Better Ocean Monuments (Forge/NeoForge)
A complete redesign of Minecraft's ocean monuments!
Loot Integrations
Allows loot from loottables to be integrated into other lootables, inherently adds better dungeon loot to a few structur...
YUNG's Better End Island (Forge/NeoForge)
An overhaul of the main End Island where the dragon fight takes place!
Relics
Just a mod about useful items with unique mechanics :3
Elytra Slot
Adds curio support to the elytra so you can fly and wear chest armor at the same time. Formerly known as Curious Elytra.
MVS - Moog's Voyager Structures
160+ structures made with vanilla blocks and entities bringing life to your world! Discover loot, enemies, & villagers a...
Chunk Sending[Forge/Fabric]
Optimizes chunk packet delivery
YUNG's Better Witch Huts (Forge/NeoForge)
Adds overhauled witch huts to swamps!
YUNG's Better Jungle Temples (Forge/NeoForge)
A complete redesign of Minecraft's jungle temples!
Creeper Overhaul
A mod which overhauls the vanilla creepers!
Goblin Traders
Adds goblins that you can find underground with unique and useful trades!
YUNG's Better Desert Temples (Forge/NeoForge)
A complete redesign of Minecraft's desert temples!
Easy Magic
Enchanting tables as they always should have been! Items stay after closing, and easy re-rolls.
Client Crafting
Clientside crafting without network delay
Easy Anvils
Be ready for overhauled anvils! Items stay, better name tags, many tweaks!
Repurposed Structures (Neoforge/Forge)
Adds more variations of vanilla structures and features such as a Jungle Fortress!
YUNG's Bridges (Forge/NeoForge)
Adds beautiful naturally generated bridges throughout the world
Cobweb
Crystal Nest API
Chloride (Embeddium++/Sodium++)
Gives Embeddium/Sodium additional Performance and Quality features for a tasteful experience
CullLessLeaves Reforged (Unofficial)
Gives you a 9% fps improvement for leaves rendering
YUNG's Extras (Forge/NeoForge)
Extra structures, features, and vanilla+ content suitable for any modpack
Alex's Delight
Adds compatibility between Alex's Mobs and Farmer's Delight
Boat Break Fix [Neo/Forge/Fabric/Quilt]
Fixes a breaking bug with boats and increases performance.
Reliquified Artifacts
Compatibility addon between Relics and Artifacts
Trading Post
Rule the village! Trade with every villager at once!
MonoLib
A non-invasive library mod for Fabric, Forge, and NeoForge.
Alex's Caves
Explore five new rare cave biomes hidden under the surface of the Overworld...
Just Enough Archaeology
JEI and EMI Archaeology addon
Nether's Delight
Nether addon for Farmer's Delight
Yung Structures Addon for Loot Integrations
Adds better loot to yung mods structures, an addon to the lootintegrations mod
Starlight (Forge)
Rewrites the light engine to fix lighting performance and lighting errors
YUNG's Cave Biomes (Forge/NeoForge)
Adds new vanilla+ cave biomes and underground content!
Friends&Foes (Forge/NeoForge)
Adds outvoted and forgotten mobs from the mob vote, expanding on their original concepts and adding new vanilla-like fea...
Illager Invasion
The illagers are back! Be ready to fight new foes. A port of Illager Expansion.
Incendium
New biomes and structures with the vanilla blocks! (1.18+)
Galosphere
This mod aims to improve the underground by adding new cave biomes, mobs, ores... etc
Bartering Station
Still running around bartering manually? Let's put those lazy piglins to work instead!
YUNG's Menu Tweaks (Forge/NeoForge)
A small, lightweight mod that makes browsing menus a lot easier
DEUF - Duplicate Entity UUID Fix
Changes UUIDs of loaded Entities in case their UUIDs are already assigned (and removes log spam).
Bygone Nether
Adds new biome-specific structures and mobs to the nether dimension
Create Stuff 'N Additions
🧲 Dominate your environment with Create technology
Radiant Gear (Fabric/Forge/Quilt)
A compatibility bridge between Curios API or Trinkets API and dynamic light mods such as Dynamic Lights and Lucent.
Harvest with ease
Don't break crops, right click them!
DnT Ancient City Overhaul
Standalone Splinter version of Dungeons and Taverns Ancient City Overhaul
Stay True
Staying True to The Original Textures.
Complementary Shaders - Reimagined
Preserving the elements of Minecraft with exceptional quality, detail, and performance.
Underground Villages
Adds underground villages to your world
More Mob Variants
Adds new variants to existing mobs.
Dynamic Lights
portable and moving lightsources
Noisium (archived)
Optimises worldgen performance for a better gameplay experience.
Enemy Expansion
Adding variety to combat encounters in Minecraft!
Adaptive Performance Tweaks: Core
The core is required for all adaptive performance tweaks modules and provides a shared API, monitoring functionally, eve...
Adaptive Performance Tweaks: Items
Item clustering (fallen blocks, experience orbs, ...) and garbage cleanup.
Curious Lanterns
Provides a hip slot for your illuminated mining needs! Requires a dynamic lights mod.
Relics: Alex's Mobs Compat
Compatibility addon between Relics and Alex's Mobs
Miner's Delight +
Farmer's Delight add-on for miners
Villagers Sell Animals [NoCube's Mods]
Adds new villager deals. Makes animals renewable. Vanilla-style
Relics: Alex's Caves Compat
Compatibility addon between Relics and Alex's Caves
Alex's Caves Delight
Adds compatibility between Alex's Caves and Farmer's Delight. Vanilla style.
Alex's Caves: Stuff & Torpedoes
💥Adds torpedoes and equipment related to Alex's Caves
TACT - Tiny Alex's Caves Tweaks
Tiny Alex's Caves Tweaks to make the mod a bit better
More Minecarts and Rails
Expands minecarts and rails to provide intuitive, viable trasportation, automation and utility solutions.
Create: Design n' Decor
A Create addon focused on QOL decoration features that expand on the base decoration ability of Create whilst focusing o...
ATi Structures
A Pack adding a variety of structures found in the overworld
DnT Stronghold Overhaul
This is the Standalone split off version from Dungeons and Taverns Stronghold Rework. It adds 417 Rooms, Unique Strongho...
Adaptive Performance Tweaks: Spawn
Optimization for monster spawn events and spawner.
Large Meals (An Add-on for Farmer's Delight)
A Farmer's Delight addon that adds new and creative recipes to the game.
Deep Dark: Regrowth
A big horror expansion for the Deep Dark with new biomes and mobs.
Adaptive Performance Tweaks: Player Login Optimization and Protection
Protects players during login and provides a special "easy" mode for less experience and child players.
Adaptive Performance Tweaks: Gamerules
Automatically adjust the random tick speed, entity cramming, raids, patrol, trader and insomnia based on the current ser...
Adaptive Performance Tweaks (Bundle)
The Adaptive Performance Tweaks mod automatically adjust specific settings on the server to allow a better TPS/FPS.
ReForgedPlay [replay mod on (neo)forge]
Replay mod port to (neo)forge! Record your adventures in minecraft
Stackable Stew and Soup
Now you can stack the default stews and soups up to a maximum of 8 (configurable)
WI Zoom
The zoom from the Wurst Client as a standalone mod.
Create: Enchantable Machinery
This mod allows you to apply some vanilla enchantment to Create blocks.
Default World Type [Forge]
Change the default world type for creating a new world
Mineral Delight
Crush, Cook and Eat Ores, Gems, and Crystals!
Create: Dynamic Village
An expansion to Create that adds a fully-featured host of Create-mod village professions.
DespawnTweaker
better Let Me Despawn optimization | Don't allow mobs from spawners to despawn
NoFog
A highly configurable client-side Fabric, Forge(<=1.20.1) and NeoForge(1.20.2+) mod that removes all fog
Illager Additions
This is a mod about illager content
Create: Protection Pixel
A fancy armor mod with steampunk/create style
Alex's Mobs Interaction
An addon that adds tons of new features specifically for the mod Alex's Mobs
Only Hammers And Excavators
A simple mod that adds various type of hammers & excavators, that mine 3x1 area
Piercing Paxels ⚒️
Dynamic Upgradable Multi-tools!
Better Brightness Slider
Drag the brightness-/gamma-slider to higher and lower values than default
Adaptive Performance Tweaks: Mods
Automatic and realtime server bundling (one mod pack for client/server) and mod clean up for better performance and less...
project-869951
Books & Ladders Wood Variants!~
Ecospherical Expansion
Overhauled generation to the biomes of the Overworld.
Phantom Loader
Phantom Loader is a library that automates part of the process of creating Minecraft mods for multiple mod loaders by ge...
Buried Wrecks
A mod that adds buried shipwrecks to the underground
HRB's Drills
A vehicle to make mining a better experience.
Cave Spelunking[Forge/Fabric]
Prevents ores from spawning not exposed to air/fluids/other ore blocks
Miner Villager
A new entity for the Mineshafts!
Modifiers
Mod that adds Terraria-style modifiers to equipment.
Spider Caves
Adds a spider cave biome and a spider armor
Azarbeat's Edible Monsters (Eat Zombies, Spiders, and much more!)
You can eat mobs now!! Enjoy the meal and have a nice day!!
project-1091132
This mod expand caves by adding a ton of stuff to make caves better like new biomes and mobs, it also adds new decorati...
project-1084974
A tiny performance mod, decreasing the rate some Create components tick at
Glowroot Caves
A cave-biome mod based on the glow squid with new mobs, structures, and mechanics.
project-1078171
Adds to cave biomes dishes and food. Vanilla style.
What is 'Stone'? (Colorful Caves)
Let's add a bit of spice to the existing caves, vanilla style!
Glowroots Two Electric Boogaloo
Adds a new biome the glowroot Cavern
Cave Maps (Better Nether Map Port)
Configurable Maps for Caves and Cave Dimensions
WHAT THE GECKO
Yes that's what you heard, here you can found geckos,reptiles, lizards,Tuataras and amphibians
[BMS-SGA] "New" Sculk Expension Cave+
Rediscover the Deep Dark of Minecraft !