seedlookoutOVERWORLD · SMALLER FEATURES
Buried Treasure
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A single hidden chest, usually under a beach or a coastal seabed. Every chest has a Heart of the Sea for crafting a conduit, along with valuable resources and gear.
This guide follows vanilla Java 26.3. Historical changes retain their own edition and version. Bedrock generation and loot can differ. Screenshots and verified seeds below retain their own game versions.
28462718234064871 · Java 26.3 · overworldReference capture · Naturally generated buried treasure chest; covering terrain was excavated for this view.Game data and source research
Where it generates in Java 26.3
Beach and Snowy Beach are the two eligible Java 26.3 starting biomes. The final biome check uses the structure generation stub rather than a rule requiring every nearby block to be sand. [2][5]
Candidate positions and rarity
Java 26.3 tests each chunk as a potential start before its frequency filter. The configured frequency filter is 1%. Candidate selection happens before successful structure generation; this is not a measured density or an average travel distance. [3][4]
The structure set tests every chunk, then applies a 0.01 frequency filter. Passing that one-percent filter is an opportunity for generation, not proof that a chest was successfully placed. [1][3][4][5]
What the starting position means
The treasure piece is anchored at chunk-local X=9 and Z=9. Its constructor receives Y=90, but the placement routine searches for support; do not treat 90 as the chest height. [1][4][5]
One buried chest, without a building
Buried treasure is a single chest placement, not a hidden dungeon. The piece searches downward for a suitable supporting block, then fills nearby air or liquid gaps before creating its chest. There is no room entrance, staircase or enclosing temple to uncover. [6]
Search the ground at the target rather than looking for an architectural landmark. Terrain can leave the chest under sand, gravel or another surface layer; the placement code decides from local block conditions instead of a fixed depth beneath the beach. [6]
Excavate around water and loose blocks
The construction path creates no resident mob or mob spawner. The immediate hazards come from the surroundings: water entering the hole, unsupported loose blocks and nearby enemies. Opening a small inspection area is more useful than digging a large underground room in search of a nonexistent structure. [6]
A treasure map or predicted point is a locator, not an inventory of the saved world. If the chest has already been removed or surrounding terrain changed, no visible ruin remains to prove where it stood. [6]
Loot and rewards in Java 26.3
The Java 26.3 buried-treasure table has a dedicated one-entry Heart of the Sea pool. The guaranteed heart belongs to an actual chest assigned this table; an explorer map or finder candidate alone does not establish that a usable chest was found. [7]
Other pools select ingots and TNT, then emeralds, diamonds or prismarine crystals. A 0-1-roll equipment pool and a 0-2-roll water-breathing potion pool can contribute nothing. Two food selections each provide 2-4 cooked fish. [7]
A separate nautilus-armor pool weighs empty 148, copper 20, iron 10, golden 5 and diamond 2, total 185. The armor draw is independent of the guaranteed heart and is scoped to this pinned version. [7]
Compared directly with Java 1.20.1, the Java 26.3 tables differ. The inspected buried treasure table gains Copper nautilus armor, Diamond nautilus armor, Golden nautilus armor, Iron nautilus armor, Iron spear. Use the current weights rather than carrying older chest percentages forward. [7][9]
| Item | Where the rule applies | What the data establishes |
|---|---|---|
 Heart of the sea | One buried-treasure-table chest | 100.0% chance; exactly one heart from its dedicated pool. [7][8] |
 Diamond | One buried-treasure-table chest | 53.1% chance of at least one selection; 1-2 diamonds per selection. [7][8] |
 Potion | One buried-treasure-table chest | 0-2 water-breathing potions; zero is a supported roll outcome. [7] |
 Diamond nautilus armor | One buried-treasure-table chest | 1.1% chance; weight 2 of total 185 in a separate one-roll pool. [7][8] |
Version history and release dates
These milestones retain their edition and exact build labels. Snapshot, beta and preview dates belong to those development builds; full releases and staggered Pocket platform releases are dated separately. Historical introduction claims come from the cited Wiki history. [10]
| Version | Released | What changed |
|---|---|---|
| Java 1.13 (18w10a) | March 6, 2018 | Introduced buried treasure. [10][12] |
| Java 1.13 (18w19a) | May 8, 2018 | Made a Heart of the Sea guaranteed in every buried treasure chest. [10][13] |
| Bedrock 1.4.0 | May 16, 2018 | Introduced buried treasure, with guaranteed Hearts of the Sea established during its beta development. [10][14] |
| Java 1.18 | November 30, 2021 | Added Water Breathing potions as possible chest loot. [10][15] |
| Java 1.21.11 | December 9, 2025 | Added iron spears and copper, iron, golden, and diamond nautilus armor to chest loot. [10][16] |
| Bedrock 1.21.130 | December 9, 2025 | Added copper, iron, golden, and diamond nautilus armor to buried treasure chest loot. [10][17] |
SeedLookout in-game verification
Screenshots
28462718234064871 · Java 26.3 · overworldReference capture · Naturally generated buried treasure chest; covering terrain was excavated for this view.Our screenshots of naturally generated structures in Minecraft. Each caption gives the seed, coordinates and version. Select one to open it at full size.
Seeds with this buried treasure
None of our verified seeds includes this structure yet. The guide cites game data, code analysis and other references; it does not verify a seed.
Sources
References identify the edition, version and evidence behind the guide. Game code and data describe generation rules; the seed table records locations checked in game. Research reviewed 2026-10-02.
- Mojang Java 26.3: structure configuration ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: data/minecraft/worldgen/structure/buried_treasure.json
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. SHA-256 by archive member: data/minecraft/worldgen/structure/buried_treasure.json = 92d65a5926147e840f25343fa87421e2f4b88f125aab5265b54d7711b48a1952
- Mojang Java 26.3: resolved starting-biome tags ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: data/minecraft/tags/worldgen/biome/has_structure/buried_treasure.json; data/minecraft/tags/worldgen/biome/is_beach.json
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. SHA-256 by archive member: data/minecraft/tags/worldgen/biome/has_structure/buried_treasure.json = 3cba22095cd0a3fb808bd2aebf2cc941ffe0829d968b1b53a3bce1241e311b36; data/minecraft/tags/worldgen/biome/is_beach.json = ce247502128c04e5999203db4139eaa317fe3586e62c671a0bd22ed3f792aea1
- Mojang Java 26.3: candidate placement settings ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: data/minecraft/worldgen/structure_set/buried_treasures.json
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. SHA-256 by archive member: data/minecraft/worldgen/structure_set/buried_treasures.json = ceebbdf4e44c459dff9aaeca1652f1c6919b28ed816179911d3267f12b3bdf96
- Mojang Java 26.3: candidate filtering and weighted retries ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: net/minecraft/world/level/chunk/ChunkGenerator.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$ExclusionZone.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReducer.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReductionMethod.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement.class; net/minecraft/world/level/levelgen/structure/placement/RandomSpreadStructurePlacement.class. Methods: RandomSpreadStructurePlacement.getPotentialStructureChunk; AbstractSpreadingStructurePlacement.isStructureChunk; ChunkGenerator.createStructures / tryGenerateStructure
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. Implementation inspected using CFR 0.152; reconstructed Java is not an original Mojang source publication. SHA-256 by archive member: net/minecraft/world/level/chunk/ChunkGenerator.class = 7e5145ec6e36cbc7af979e869d4947c85e4715b8d13105f1369f0a385c40851d; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$ExclusionZone.class = eb0d49eb1ffb0714fbdb04abde954fbdbd50cfeafd411f593de8159a06488300; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReducer.class = e2887ebf5f8937ca3b038d6e1c40bc1c77f983a97b5b7ed9bdcd78b59d103e82; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReductionMethod.class = 3664480026b9e91c8235bdbf6d98fdbbb78586f8d0decee70f9ea788d3291a71; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement.class = 0775a5cd47242fafd7f9977a9cfb821a6fffe5d1defcbc3bf8cded7e2427a4a8; net/minecraft/world/level/levelgen/structure/placement/RandomSpreadStructurePlacement.class = 8fbeed7711f96285b9b39b2e8363ffaa6ea80dd03baea4c1e6fa98e90b7f8eb9
- Mojang Java 26.3: generation entry points ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: net/minecraft/world/level/levelgen/structure/Structure$GenerationContext.class; net/minecraft/world/level/levelgen/structure/Structure$GenerationStub.class; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings$Builder.class; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings.class; net/minecraft/world/level/levelgen/structure/Structure.class; net/minecraft/world/level/levelgen/structure/structures/BuriedTreasurePieces$BuriedTreasurePiece.class; net/minecraft/world/level/levelgen/structure/structures/BuriedTreasurePieces.class; net/minecraft/world/level/levelgen/structure/structures/BuriedTreasureStructure.class. Methods: BuriedTreasureStructure.findGenerationPoint; Structure.findValidGenerationPoint; Structure.GenerationContext.isValidBiome; BuriedTreasurePieces.BuriedTreasurePiece.postProcess
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. Implementation inspected using CFR 0.152; reconstructed Java is not an original Mojang source publication. SHA-256 by archive member: net/minecraft/world/level/levelgen/structure/Structure$GenerationContext.class = 0c4335baa022b0482299b5cc0a3d0492fd3160542640b2538a5b8934822cc12b; net/minecraft/world/level/levelgen/structure/Structure$GenerationStub.class = e7a25f7418cfbfafaa6ecc1558a4bacde160ab247be6997df4aef3288da76a52; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings$Builder.class = e9b9a37f14f156749ceb686ab31f34954c3b65c0e9f1ff43cdebb508a72b1261; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings.class = 5796d330ef7ea491ee64b34ccdfe6c08a62b71886441bd87cd327a2fc6188f80; net/minecraft/world/level/levelgen/structure/Structure.class = fa023ce735376b7042242948275a0869a7e22d30e5e4c5c6502b521578577188; net/minecraft/world/level/levelgen/structure/structures/BuriedTreasurePieces$BuriedTreasurePiece.class = 94d386035ff7b7ead6594fb950637ad74aa1027fd769758a8d9e0f2f648ad288; net/minecraft/world/level/levelgen/structure/structures/BuriedTreasurePieces.class = ba80ea892398d423418fd6c5fe55fbb23d464234b72fe404ef2046283bb55295; net/minecraft/world/level/levelgen/structure/structures/BuriedTreasureStructure.class = db3d0f08cc54817c5173ab3317dd73e029c0189e2d6f2bc4c6fae350c3222385
- Mojang Java 26.3: buried treasure layout and encounter implementation ↗
net.minecraft.world.level.levelgen.structure.structures.BuriedTreasurePieces; BuriedTreasurePieces.BuriedTreasurePiece.postProcess / isLiquid.
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c; inner META-INF/versions/26.3/server-26.3.jar SHA-256 a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6. Official bytecode inspected through CFR 0.152; reconstructed implementation, not an original source checkout.
- Mojang Java 26.3: buried treasure loot data ↗
Inner META-INF/versions/26.3/server-26.3.jar: data/minecraft/loot_table/chests/buried_treasure.json
Evidence details
Verified official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. File SHA-256s: buried_treasure.json: a32bed5454aa644fcbf3505968fd0019c868316051e94a7eac9b3351d6ec94e1. Table identity and conditional item rules are distinct from any particular generated container.
- Java 26.3 buried treasure: calculated selection odds ↗
Relevant /pools indices in the data reference; LootPool.addRandomItem/addRandomItems; UniformContainerBase.uniformFields; UniformGenerator.getIntUnsafe.
Evidence details
For direct unconditional weighted pools, chance of at least one selection is 1 minus the average of (1−weight/totalWeight)^n over inclusive uniform integer rolls. Values are theoretical table-invocation probabilities, not seed frequencies. Exact inputs: [{"itemId":"minecraft:heart_of_the_sea","table":"data/minecraft/loot_table/chests/buried_treasure.json","pool":0,"fraction":"1","chance":1.0,"weight":1,"total":1,"rolls":[1]},{"itemId":"minecraft:diamond","table":"data/minecraft/loot_table/chests/buried_treasure.json","pool":2,"fraction":"43/81","chance":0.5308641975308642,"weight":5,"total":15,"rolls":[1,2,3]},{"itemId":"minecraft:diamond_nautilus_armor","table":"data/minecraft/loot_table/chests/buried_treasure.json","pool":6,"fraction":"2/185","chance":0.010810810810810811,"weight":2,"total":185,"rolls":[1]}]
- Mojang Java 1.20.1: inspected historical buried treasure loot ↗
data/minecraft/loot_tables/chests/buried_treasure.json
Evidence details
Limited comparison of the listed data files; no claim that all intermediate releases share either table. SHA-256s: buried_treasure.json: 3e77c8b99c8dc1de679ee807a274624918b1b3e2764c773d1910cb792716fe7e
- Minecraft Wiki: Buried Treasure — pinned history ↗
History section, retaining edition, release grouping, development-version and experimental-toggle qualifiers.
Evidence details
Pinned article revision 3790280 from 2026-09-23T12:07:37Z. Historical claims only; not an audited game build or release-date source.
- Minecraft Wiki: Buried Treasure description ↗
Opening description and History
Evidence details
Pinned article revision 3790280; retrieved October 1, 2026. Article history supports historical introductions; current generation and loot are audited separately from game data.
- Java 1.13 (18w10a): release date ↗
/id; /releaseTime
Evidence details
Date belongs to the exact 18w10a build. Snapshot and prerelease dates are separate from the later full release; metadata does not prove the feature introduction.
- Java 1.13 (18w19a): release date ↗
/id; /releaseTime
Evidence details
Date belongs to the exact 18w19a build. Snapshot and prerelease dates are separate from the later full release; metadata does not prove the feature introduction.
- Bedrock 1.4.0: release date ↗
Version infobox release date
Evidence details
Platform releases were staggered: May 16, 2018<ref name=OutNow>{{Mcnet|update-aquatic-phase-one-out-now|Update Aquatic Phase One is out now!|May 16, 2018|Tom Stone}}</ref>. These dates describe full Pocket releases, separately from earlier betas.
- Java 1.18: release date ↗
/id; /releaseTime
Evidence details
Date belongs to the exact 1.18 build. Snapshot and prerelease dates are separate from the later full release; metadata does not prove the feature introduction.
- Java 1.21.11: release date ↗
/id; /releaseTime
Evidence details
Date belongs to the exact 1.21.11 build. Snapshot and prerelease dates are separate from the later full release; metadata does not prove the feature introduction.
- Bedrock 1.21.130: release date ↗
Version infobox release date
Evidence details
Pinned community version article date; snapshots, betas and previews have their own release dates, separately from the full version.
Item art uses vanilla Java 26.3 assets from the official client release. Icons retain their game version alongside the guide.
Descriptions adapted from the Minecraft Wiki retain its attribution under CC BY-NC-SA 3.0. Calculations and code analysis are SeedLookout research. Screenshot captions identify each capture. The seed table contains our published verified seeds; checking a location does not establish particular room contents or chest loot.