Ocean Ruins

Ocean (all variants)
Beach (sometimes)

Consists of

Can generate in
existing chunks

No

Ocean ruins or underwater ruins are oceanic structures primarily composed of stone bricks or sandstone. They come in many different sizes varying from large villages to single ruined huts. They are rare, and have cold and warm variants.

Generation[]

Cold ocean ruins generate in normal, cold, and frozen ocean biomes, as well as their deep variants. They are composed of stone materials.

Warm ocean ruins generate in warm, lukewarm, and deep lukewarm ocean biomes, and are composed of sandstone and stone materials.

Although most ocean ruins generate underwater, they sometimes generate on land.

30% of ocean ruins generate as large ocean ruins; the other 70% generate as small ruins. If the ocean ruin is large, there is a 90% chance for 4-8 (inclusive) small ocean ruins to generate around it in a cluster. If the ocean ruin is warm, large ocean ruins generate with a structure integrity of 0.9 and small ocean ruins generate with a structure integrity of 0.8. If the ocean ruin is cold, the "brick" variant of the chosen structure type generates with a structure integrity of 0.9 if large and 0.8 if small. The "cracked" variant generates with a structure integrity of 0.7, and the "mossy" variant generates with a structure integrity of 0.5, both regardless of size. Reduced structure integrity may also remove drowned and loot chests from the structures.^[verify]

During generation, all air blocks and structure blocks act as structure voids.

Structure[]

The shape and size of ocean ruins varies greatly, and they often generate together in groups to create ruined villages.

All but two of the structures contain a loot chest with loot inside. The chest contains loot for specifically either a small or large sized ocean ruin structure and may be buried by some sort of material such as gravel and sand. Ocean ruins too may be at least partially buried including with their airspaces.

Cold ocean ruins are primarily composed of stone bricks and gravel, and also contain prismarine, sand, magma blocks, sea lanterns, polished granite, glazed terracotta, bricks, planks, cobblestone, mossy cobblestone, stone brick stairs, obsidian, and/or a chest with loot in it. Warm ocean ruins are primarily composed of sand and sandstone, and also contain polished granite, polished diorite, sea lanterns, magma blocks, gravel, terracotta, sandstone stairs, and/or a loot chest.

Many of the structures spawn with drowned (usually 1–2, though a few structures have 3 or 4).

Note that natural ocean ruins generate following the rules above and may not exactly match the stored structures.

Each structure below is located in the folder client.jar/data/minecraft/structures/underwater_ruin. The following is a complete table of the structures with their filenames, descriptions and what they consist of: (each stucture block indicates the spawn location of a drowned)

Cold ocean ruins[]

Structure name	Description	Consists of
`underwater_ruin/big_brick_1` `underwater_ruin/big_cracked_1` `underwater_ruin/big_mossy_1`	A chunk-sized structure with a mostly gravel floor and a large, multidimensional arch. These 3 generate as an integrated whole.	215~239 Gravel 97 in total Stone Bricks, Cracked, Mossy 8 Chiseled Stone Bricks 4~5 Prismarine 3~4 Magma Block 1 Sand 1 Chest (random loot) 1~2 Drowned
`underwater_ruin/big_brick_2` `underwater_ruin/big_cracked_2` `underwater_ruin/big_mossy_2`	A chunk-sized structure consisting of two connected rooms, one taller than the other. These 3 generate as an integrated whole.	209 in total Stone Bricks, Cracked, Mossy 192~206 Gravel 39 Chiseled Stone Bricks 15 Polished Granite 5~7 Prismarine 4 Purple Glazed Terracotta 2 Sea Lantern 1~5 Magma Block 1 Chest (random loot) 1~2 Drowned
`underwater_ruin/big_brick_3` `underwater_ruin/big_cracked_3` `underwater_ruin/big_mossy_3`	A chunk-sized structure consisting of two large unconnected rooms, one much taller than the other and having an open top. These 3 generate as an integrated whole.	301 in total Stone Bricks, Cracked, Mossy 205~217 Gravel 55 Chiseled Stone Bricks 17 Polished Granite 10 Bricks 2~8 Sand 2 Sea Lantern 1~2 Magma Block 1 Chest (random loot) 1~3 Drowned
`underwater_ruin/big_brick_8` `underwater_ruin/big_cracked_8` `underwater_ruin/big_mossy_8`	A chunk-sized structure with little height, looks similar to a floorplan of a large building. Remnants of wood floors are present. These 3 generate as an integrated whole.	210~224 Gravel 88 in total Stone Bricks, Cracked, Mossy 8~12 Sand 9 Spruce Planks 8 Dark Oak Planks 3 Magma Block 1 Chest (random loot) 1~2 Drowned
`underwater_ruin/brick_1` `underwater_ruin/cracked_1` `underwater_ruin/mossy_1`	A small building without a roof. These 3 generate as an integrated whole.	36~38 Gravel 32~37 in total Stone Bricks, Cracked, Mossy 17~19 Mossy Cobblestone 1 Sea Lantern 0~1 Magma Block 0~1 Chest (random loot) 0~1 Drowned
`underwater_ruin/brick_2` `underwater_ruin/cracked_2` `underwater_ruin/mossy_2`	A small structure with not much height. Consists of randomly placed stone bricks and mossy cobblestone. These 3 generate as an integrated whole.	30~39 Gravel 9 in total Stone Bricks, Cracked, Mossy 6~10 Mossy Cobblestone 2 Magma Block 1 Chest (random loot) 0~2 Drowned
`underwater_ruin/brick_3` `underwater_ruin/cracked_3` `underwater_ruin/mossy_3`	A small structure featuring a stone brick arch. These 3 generate as an integrated whole.	30~35 Gravel 20~21 in total Stone Bricks, Cracked, Mossy 2 Stone Brick Stairs 1~2 Chiseled Stone Bricks 1~2 Magma Block 1~5 Sand 1 Cobblestone 0~1 Obsidian 1 Chest (random loot)
`underwater_ruin/brick_4` `underwater_ruin/cracked_4` `underwater_ruin/mossy_4`	A small structure featuring a small, domed building. These 3 generate as an integrated whole.	70~71 in total Stone Bricks, Cracked, Mossy 27~35 Gravel 3~6 Sand 1~6 Dark Oak Planks 0~4 Magma Block 0~2 Spruce Planks 1 Chest (random loot) 0~2 Drowned
`underwater_ruin/brick_5` `underwater_ruin/cracked_5` `underwater_ruin/mossy_5`	A small structure with a small, cuboid building. These 3 generate as an integrated whole.	37~39 Gravel 35 in total Stone Bricks, Cracked, Mossy 9 Polished Granite 8 Chiseled Stone Bricks 1 Chest (random loot) 0~1 Drowned
`underwater_ruin/brick_6` `underwater_ruin/cracked_6` `underwater_ruin/mossy_6`	A small structure that looks similar to a castle tower. These 3 generate as an integrated whole.	58 in total Stone Bricks, Cracked, Mossy 41~43 Gravel 24 Stone Brick Stairs 2 Chiseled Stone Bricks 2 Polished Granite 0~3 Mossy Cobblestone 0~1 Magma Block 1 Chest (random loot) 0~4 Drowned
`underwater_ruin/brick_7` `underwater_ruin/cracked_7` `underwater_ruin/mossy_7`	A small structure that resembles brick_5/cracked_5/mossy_5, although with a slightly taller roof. These 3 generate as an integrated whole.	40 in total Stone Bricks, Cracked, Mossy 35 Gravel 6 Mossy Cobblestone 4 Chiseled Stone Bricks 1 Magma Block 1 Polished Granite 1 Chest (random loot) 0~1 Drowned
`underwater_ruin/brick_8` `underwater_ruin/cracked_8` `underwater_ruin/mossy_8`	A small structure that looks similar to an igloo, although made of stone materials. These 3 generate as an integrated whole.	41 in total Stone Bricks, Cracked, Mossy 25~28 Gravel 11 Chiseled Stone Bricks 3~5 Dark Oak Planks 1~2 Magma Block 0~1 Obsidian 1 Chest (random loot) 0~1 Drowned

Warm ocean ruins[]

Structure name	Description	Consists of
`underwater_ruin/big_warm_4`	A chunk-sized structure featuring a large sandstone arch.	220 Sand 152 Cut Sandstone 24 Polished Granite 18 Chiseled Sandstone 4 Sea Lantern 3 Magma Block 1 Chest (random loot) 2 Drowned
`underwater_ruin/big_warm_5`	A chunk-sized structure with a tall tower in the center. It looks similar to a fountain.	222 Sand 43 Cut Sandstone 12 Sandstone 8 Polished Granite 5 Magma Block 4 Polished Diorite 2 Sea Lantern 1 Chest (random loot) 4 Drowned
`underwater_ruin/big_warm_6`	A chunk-sized structure featuring 4 sandstone arches.	219 Sand 129 Cut Sandstone 4 Chiseled Sandstone 4 Magma Block 2 Sandstone 2 Sea Lantern 1 Chest (random loot) 2 Drowned
`underwater_ruin/big_warm_7`	A chunk-sized structure with an open sandstone dome.	202 Sand 100 Cut Sandstone 24 Gravel 8 Chiseled Sandstone 4 Polished Granite 2 Magma Block 2 Sandstone 1 Sea Lantern 1 Chest (random loot) 2 Drowned
`underwater_ruin/warm_1`	A small structure with an open dome. Looks like a smaller version of big_warm_7.	75 Cut Sandstone 47 Sand 7 Polished Granite 1 Chest (random loot)
`underwater_ruin/warm_2`	A small hut with a large opening in the front.	42 Sand 36 Cut Sandstone 2 Light Blue Terracotta 2 Polished Granite 1 Chest (random loot) 2 Drowned
`underwater_ruin/warm_3`	A small hut that has an entrance on all sides.	36 Sand 24 Cut Sandstone 13 Polished Granite 2 Magma Block 1 Chest (random loot) 1 Drowned
`underwater_ruin/warm_4`	A small structure featuring two small arches.	42 Sand 28 Cut Sandstone 10 Sandstone Stairs 2 Chiseled Sandstone 1 Magma Block 1 Chest (random loot) 1 Drowned
`underwater_ruin/warm_5`	A small structure that is essentially a roof with multiple supports.	37 Sand 34 Cut Sandstone 1 Chest (random loot) 1 Drowned
`underwater_ruin/warm_6`	A small hut that looks similar to the ruin5 series, although made of sand materials. It is filled with sand and the entrance is blocked off.	48 Sand 39 Cut Sandstone 4 Light Blue Terracotta 1 Magma Block 1 Chest (random loot)
`underwater_ruin/warm_7`	A small structure that looks similar to the ruin2 series, although made of sand materials.	34 Sand 6 Cut Sandstone 3 Polished Granite 1 Chest (random loot)
`underwater_ruin/warm_8`	A thin wall with multiple "windows". Appears to be a miniature cross section of big_warm_4.	56 Sand 19 Cut Sandstone 5 Magma Block 4 Sandstone Stairs 1 Chest (random loot) 1 Drowned

Loot[]

In Java Edition, each underwater ruin big chest contains items drawn from 2 pools, with the following distribution:

Item	Stack Size ^[A]		Weight ^[B]		Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Item	2–8×	1×	2–8×	1×	Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Coal	1–4	—	¹⁰⁄₃₁	—	81.0%	4.032	1.2
Wheat	2–3	—	¹⁰⁄₃₁	—	81.0%	4.032	1.2
Gold Nugget	1–3	—	¹⁰⁄₃₁	—	81.0%	3.226	1.2
Buried Treasure Map	—	1	—	¹⁰⁄₂₃	43.5%	0.435	2.3
Enchanted Book^[F]	—	1	—	⁵⁄₂₃	21.7%	0.217	4.6
Enchanted Fishing Rod^[F]	—	1	—	⁵⁄₂₃	21.7%	0.217	4.6
Emerald	1	—	¹⁄₃₁	—	14.9%	0.161	6.7
Leather Tunic	—	1	—	¹⁄₂₃	4.3%	0.043	23.0
Golden Apple	—	1	—	¹⁄₂₃	4.3%	0.043	23.0
Golden Helmet	—	1	—	¹⁄₂₃	4.3%	0.043	23.0

In Bedrock Edition, each underwater ruin big chest contains items drawn from 2 pools, with the following distribution:

Item	Stack Size ^[A]		Weight ^[B]		Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Item	2–8×	1×	2–8×	1×	Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Coal	1–4	—	¹⁰⁄₃₁	—	81.0%	4.032	1.2
Wheat	2–3	—	¹⁰⁄₃₁	—	81.0%	4.032	1.2
Gold Nugget	1–3	—	¹⁰⁄₃₁	—	81.0%	3.226	1.2
Buried Treasure Map	—	1	—	¹⁰⁄₂₃	43.5%	0.435	2.3
Enchanted Book^[F]	—	1	—	⁵⁄₂₃	21.7%	0.217	4.6
Enchanted Fishing Rod^[F]	—	1	—	⁵⁄₂₃	21.7%	0.217	4.6
Emerald	1	—	¹⁄₃₁	—	14.9%	0.161	6.7
Leather Tunic	—	1	—	¹⁄₂₃	4.3%	0.043	23.0
Golden Apple	—	1	—	¹⁄₂₃	4.3%	0.043	23.0
Golden Helmet	—	1	—	¹⁄₂₃	4.3%	0.043	23.0

↑ ^a ^b The size of stacks (or for unstackable items, number) of this item on any given roll.
↑ ^a ^b The weight of this item relative to other items in the pool.
↑ ^a ^b The odds of finding any of this item in a single chest.
↑ ^a ^b The number of items expected per chest, averaged over a large number of chests.
↑ ^a ^b The average number of chests the player should expect to search to find any of this item.
↑ ^a ^b ^c ^d All enchantments are equally probable, including treasure enchantments (except Soul Speed), and any level of the enchantment is equally probable.

In Java Edition, each underwater ruin small chest contains items drawn from 2 pools, with the following distribution:

Item	Stack Size ^[A]		Weight ^[B]		Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Item	2–8×	1×	2–8×	1×	Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Coal	1–4	—	¹⁰⁄₂₈	—	84.2%	4.464	1.2
Wheat	2–3	—	¹⁰⁄₂₈	—	84.2%	4.464	1.2
Rotten Flesh	1	—	⁵⁄₂₈	—	59.6%	0.893	1.7
Buried Treasure Map	—	1	—	⁵⁄₁₂	41.7%	0.417	2.4
Enchanted Fishing Rod^[F]	—	1	—	⁵⁄₁₂	41.7%	0.417	2.4
Stone Axe	1	—	²⁄₂₈	—	30.2%	0.357	3.3
Emerald	1	—	¹⁄₂₈	—	16.4%	0.179	6.1
Leather Tunic	—	1	—	¹⁄₁₂	8.3%	0.083	12.0
Golden Helmet	—	1	—	¹⁄₁₂	8.3%	0.083	12.0

In Bedrock Edition, each underwater ruin small chest contains items drawn from 2 pools, with the following distribution:

Item	Stack Size ^[A]		Weight ^[B]		Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Item	2–8×	1×	2–8×	1×	Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Coal	1–4	—	¹⁰⁄₂₈	—	84.2%	4.464	1.2
Wheat	2–3	—	¹⁰⁄₂₈	—	84.2%	4.464	1.2
Rotten Flesh	1	—	⁵⁄₂₈	—	59.6%	0.893	1.7
Buried Treasure Map	—	1	—	⁵⁄₁₂	41.7%	0.417	2.4
Enchanted Fishing Rod^[F]	—	1	—	⁵⁄₁₂	41.7%	0.417	2.4
Stone Axe	1	—	²⁄₂₈	—	30.2%	0.357	3.3
Emerald	1	—	¹⁄₂₈	—	16.4%	0.179	6.1
Leather Tunic	—	1	—	¹⁄₁₂	8.3%	0.083	12.0
Golden Helmet	—	1	—	¹⁄₁₂	8.3%	0.083	12.0

↑ ^a ^b The size of stacks (or for unstackable items, number) of this item on any given roll.
↑ ^a ^b The weight of this item relative to other items in the pool.
↑ ^a ^b The odds of finding any of this item in a single chest.
↑ ^a ^b The number of items expected per chest, averaged over a large number of chests.
↑ ^a ^b The average number of chests the player should expect to search to find any of this item.
↑ ^a ^b All enchantments are equally probable, including treasure enchantments (except Soul Speed), and any level of the enchantment is equally probable.

Achievements[]

Icon		Achievement	In-game description	Actual requirements (if different)	Gamerscore earned	Trophy type (PS4)
PS4	Other platforms	Achievement	In-game description	Actual requirements (if different)	Gamerscore earned	Trophy type (PS4)
		Atlantis?	Find an underwater ruin	—	20G	Silver

History[]

The first official image of underwater ruins.

Java Edition
December 27, 2017			A picture was released on Minecraft.net, which shows a faint underwater ruins structure in the top right corner, more visible when the image is brightened.
February 15, 2018			Minecraft's Instagram account posted a video clip showing the underwater ruins that were to be added in the Update Aquatic.
1.13	18w09a		Added underwater ruins. They are found commonly.
	18w10a		Buried treasure explorer maps now generate in the chests of underwater ruins.
	18w16a		Drowned now spawn in underwater ruins.
1.16	20w06a		Underwater Ruins are much less common.
Bedrock Edition
1.4.0	beta 1.2.20.1		Added underwater ruins.
Legacy Console Edition
TU68	1.76	Patch 38	Added underwater ruins.
Education Edition
1.4.0			Added underwater ruins.

Issues[]

Issues relating to "Ocean Ruins" are maintained on the bug tracker. Report issues there.

Trivia[]

An ocean ruin in Bedrock Edition that generated completely on land. Note the water block above it that has not been updated.

An ocean ruin in *Java Edition* that also generated completely on land. Note that the loot chest is not waterlogged and doesn't have a water block on it.

In Bedrock Edition, ocean ruins generate with approximately equal spacing in the X and Z directions.
In the Bedrock Edition, the loot chest of ocean ruins generates with a water block above it.^[1] This can be seen in the image on the right. In Java Edition though, this is not the case, according to the second picture.^[2]

Gallery[]

Parts of a larger ruin peek out of the seabed.
Underwater ruined Village.
Chest found inside a larger building with multiple rooms.
Ruins generated beside a Badlands.
Small ocean ruins generated in Lukewarm Ocean.
A chest located in an ocean ruins building, that is hidden by a block, viewed in Spectator mode.
Another screenshot of an ocean ruins structure.
Underwater ruins generated within a coral reef.
A ruined village inhabited by drowned.
The drowned can sometimes spawn in positions that they can't get out of.

Odd generation[]

A ruined village partially generated on land.
Ruins generated on an island.
An ocean ruin completely generated on a hill near the water.
A ruined village generated on frozen ocean and beaches.
Ruins generated on land in Bedrock Edition, note that water generated above the chest.
Part of a ruin generated on a windswept hills. The rest of the ruins are in the ocean below. A Village can be seen as well.
A ruined village that generated on land in Java Edition, note that a loot chest is visible and is not waterlogged unlike in Bedrock Edition.
Underwater ruins generated on land.
Underwater ruins generated intersecting an ocean monument, exposing the treasure room.
Underwater ruins with two chests, with a couple of blocks separating them.

References[]

Generated structures and terrain features

[stacksize-1] The size of stacks (or for unstackable items, number) of this item on any given roll.

[weight-2] The weight of this item relative to other items in the pool.

[chance-3] The odds of finding any of this item in a single chest.

[items-4] The number of items expected per chest, averaged over a large number of chests.

[chests-5] The average number of chests the player should expect to search to find any of this item.

[enchant-randomly-6] All enchantments are equally probable, including treasure enchantments (except Soul Speed), and any level of the enchantment is equally probable.

[stacksize-7] The size of stacks (or for unstackable items, number) of this item on any given roll.

[weight-8] The weight of this item relative to other items in the pool.

[chance-9] The odds of finding any of this item in a single chest.

[items-10] The number of items expected per chest, averaged over a large number of chests.

[chests-11] The average number of chests the player should expect to search to find any of this item.

[enchant-randomly-12] All enchantments are equally probable, including treasure enchantments (except Soul Speed), and any level of the enchantment is equally probable.

[13] MCPE-36793

[14] MC-136156

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Minecraft Wiki