The Seamless Descent
Fully compatible with Immersive Portals. No loading screens. Aligned mysterious-stone shafts pierce through the bedrock — dig through one and look down into the void. The Overworld and Alpha are vertically stacked.
A forgotten Alpha world, buried alive under your Overworld. Silent, skyless, and untouched by time.
You don't need a portal. You just need to dig deep enough. Punch through the mysterious stone in the bedrock layer and fall into a dimension frozen in 2010.
Fully compatible with Immersive Portals. No loading screens. Aligned mysterious-stone shafts pierce through the bedrock — dig through one and look down into the void. The Overworld and Alpha are vertically stacked.
Alpha terrain generation with authentic Perlin noise, worm caves, Alpha fast-lighting, and the original C418 soundtrack. Classic textures on every block, no biome tinting — exactly how it looked in 2010.
Travel 12,550,821 blocks from spawn and witness the breakdown of logic. The genuine integer overflow terrain generating exactly as it did back then. Configurable distance via config.
Brick pyramids, abandoned dev houses with loot, scattered campsites, obsidian monoliths. Traces of activity, but no one is home. Rare item remains from long-dead adventurers.



Mojang's never-shipped ruby concept, restored as Alpha-exclusive content. Mine ruby ore deep underground, craft a full tool set and armor — stronger than iron, just shy of diamond. With JEI integration for recipes.
Disabled by default. For those who seek the true anxiety of early Minecraft. Every system is independently toggleable.
Subtle Herobrine-style presence. Operates on indirect observation — no jumpscares. Builds escape towers (without success), accepts offerings, leaves signs with cryptic messages. Will offer aid when you're desperate. Three stages of escalation tied to your time in the dimension.
A Far Lands boundary glitch. Distant blank silhouette with stiff, wrong movement. Only appears after 15 minutes in the Alpha dimension, farther from spawn. Leaves behind block anomalies — chopped logs, misplaced blocks, narrow tunnels — and low rumbles.
False Presence events shift the world around you — torches appear and vanish, doors toggle, furnaces light themselves, distant campfire smoke where there's no camp. Plus the Almost Normal House: a procedural cabin that's just... slightly wrong.
Every system is configurable via Cloth Config, or by editing
config/alpha_below.json on a dedicated server.
Requires Cloth Config. Compatible with other dimension mods.
Immersive Portals is highly recommended for seamless vertical stacking.