# Minecraft Caves And Cliffs Preview Datapack

> Minecraft Caves & Cliffs Prototype Data Pack 洞穴与悬崖预览数据包：8个版本历史（Version 1-8，21w15a 到 1.17-pre2）、Noise Caves 噪声洞穴（spaghetti caves 长弯曲、cheese caves 瑞士奶酪孔洞）、Aquifers 含水层（替代水下雕刻洞穴、Y=31以下生成水体、岩浆块漩涡气泡柱、海洋/河流鱼类生成）、Cracks 裂缝（比峡谷更窄更直、从表面延伸到90方块深板岩）、World Height 世界高度（-64..319 建造范围384）、Ore Changes 矿石变化（spread-type 分布型生成、coal/copper/diamond/emerald/gold/iron/lapis/redstone 分布范围和频率变化）、Deepslate 深板岩（Y=0以下主要岩石、stone→deepslate 过渡）、Diorite/Andesite/Granite 闪长岩/安山岩/花岗岩（更大更圆更稀有簇、Y=0以下不生成）、Noodle Caves 面条洞穴（比spaghetti更窄更弯曲更紧凑）、Ore Veins 矿脉（大型铜矿脉+花岗岩/大型铁矿脉+凝灰岩、raw iron/copper blocks）、Candle/Bundle 合成配方变更。

- Skill: `zmjjkk123-hub/minecraft-caves-and-cliffs-preview-datapack` (Agent Skill)
- Install (CLI): `npx skillmds@latest add zmjjkk123-hub/minecraft-caves-and-cliffs-preview-datapack`
- Raw SKILL.md: https://api.skillmd.com/api/skills/zmjjkk123-hub/minecraft-caves-and-cliffs-preview-datapack/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ZMJJKK123-hub (https://skillmd.com/u/zmjjkk123-hub)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/zmjjkk123-hub/minecraft-caves-and-cliffs-preview-datapack

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# Caves & Cliffs Prototype Data Pack

A Mojang-published data pack (like Bedrock's experimental gameplay), first shipped with snapshot 21w15a (April 14, 2021), letting players experience the worldgen changes between 21w06a and 21w14a before 1.18 development.

## Version 1 (21w15a)

- **Noise caves**: spaghetti caves (long/curved, sometimes wide like tagliatelle) and cheese caves (Swiss-cheese-like holes of varying sizes); noise-generator based; entrances form where caves meet the surface.
- **Aquifers**: replace old underwater carver caves and canyons; generate water bodies in noise caves (below Y=31); magma blocks on aquifer floors create whirlpool bubble columns; fish spawn in aquifers under oceans/rivers.
- **Cracks (fissures)**: narrower/straighter than canyons, extending from the surface up to 90 blocks deep into deepslate.
- **World height**: buildable range now −64..319 (384 total).
- **Ore changes**: most ores gained spread-type generation (like lapis); some kept linear too. Coal: spread Y0–192 (peak 96) + linear Y136–319; copper: linear Y0–63; diamond: spread Y−144..16 (peak −64) + separate large clusters; emerald: spread Y32–480 (peak 256); gold: spread Y−64..32 (peak −16; badlands unchanged); iron: linear Y−64..−32 + spread Y−24..56 (peak 16) + spread Y128–384 (peak 256); lapis: spread Y−32..32 (peak 0) + linear Y−64..64 (buried like ancient debris); redstone: spread Y−96..−32 (peak −64) + linear Y−64..15. Frequency changes: less exposed coal, less copper, smaller/more frequent diamond blobs (50% not air-exposed), more emerald, more gold (50% not exposed), less iron, more buried lapis, less redstone. Deep variants generate when replacing deepslate/tuff (coal/copper/emerald never below Y=0 → no deep variants).
- **Deepslate**: primary rock below Y=0; stone→deepslate transition Y=−1..−8, full below −8; tuff randomly replaces deepslate there; still clusters at Y0–16.
- **Diorite/andesite/granite**: larger, rounder, rarer clusters; never below Y=0.
- Dirt never below Y=0; tuff clusters below Y=0; lava starts at Y=−54; strongholds fully wrapped in deepslate.

## Version 2 (21w16a)

Rare snaking ore veins: large copper veins with granite above Y=0; large iron veins with tuff below Y=0. Aquifers below Y=0 can be fully lava.

## Version 3 (21w17a)

Noodle caves (narrower, more winding, tighter than spaghetti). Veins rarer/smaller, ore unevenly distributed with more clustering, may contain raw iron/copper blocks. Emerald now replaces granite/diorite/andesite/tuff/deepslate; coal/copper can replace deepslate/tuff at Y0–16 (deep variants).

## Version 4 (21w18a)

Slightly less copper; medium iron clusters rarer; small iron cluster max height −32 → 64. Veins smaller/rarer with more raw metal blocks. Carver caves now generate under oceans below Y=0; noodle caves no longer above Y=30; larger minimum sizes for carvers and noodles. Deepslate no longer clusters above Y=0 (deep coal/copper gone again).

## Version 5 (21w19a)

Bundle and candle crafting recipes added.

## Version 6 (21w20a)

No listed changes.

## Version 7 (1.17-pre1)

Candle crafting recipe removed.

## Version 8 (1.17-pre2)

For 1.17-pre2+; no listed changes.

## Trivia

The pack adds no new worldgen mechanisms — it simply enables mechanisms already present in the client.jar since 21w15a but inactive in vanilla.