Cold Ocean Ruins

Cold Ocean Ruins
Biomes	Ocean; Frozen Ocean; Cold Ocean; Deep Ocean; Deep Frozen Ocean; Deep Cold Ocean;
Mobs	Drowned; Zombie Nautilus
Generates in; existing chunks	No
	Bricks; Chest (random loot); Chiseled Stone Bricks; Cobblestone; Cracked Stone Bricks; Dark Oak Planks; Gravel; Kelp; Kelp Plant; Magma Block; Mossy Cobblestone; Mossy Stone Bricks; Obsidian; Polished Diorite; Polished Granite; Prismarine; Purple Glazed Terracotta; Sand; Sea Lantern; Seagrass; Spruce Planks; Stone Bricks; Stone Brick Stairs; Suspicious Gravel; Tall Seagrass; Water;

Cold ocean ruins are variants of ocean ruins. They are underwater structures primarily composed of stone bricks. They are found in ocean biomes and rarely on beaches, and are inhabited by drowned and sometimes zombie nautiluses alongside them. They contain chests and suspicious gravel that contain a variety of loot, most notably buried treasure maps, exclusive pottery sherds, nautilus armor, and emeralds.

Generation

Cold ocean ruins generate in normal, cold, and frozen ocean biomes or in their deep variants. They are composed of stone materials and contain some suspicious gravel blocks that can be excavated using a brush.

Ocean ruins may at times be at least partially buried, including with their airspaces. During generation, all air blocks and structure blocks act as structure voids. This means that their associated suspicious blocks are also located under layers of usual gravel, and even stone.

Suspicious gravel randomly replaces normal gravel during generation, and are not part of the structure definition.

Although most ocean ruins generate underwater, they sometimes generate on land, bordering a beach or another seaside biome. 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. 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 zombie nautiluses from the structures.

Structure

The shape and size of cold 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 under blocks such as gravel.

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

Natural cold ocean ruins generate following the rules above and may not exactly match the stored structures.

The structures below are 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 structure block indicates either a chest with random loot or the spawn location of a drowned/zombie nautilus mob.

Mobs


Drowned	Zombie Nautilus

Upon world generation, many of the structures spawn with drowned (usually one or two, though a few structures have three or four). These drowned are persistent, and do not despawn. Adult drowned wielding tridents may also also spawn riding a zombie nautilus as a zombie nautilus jockey.

Zombie nautiluses spawned from ruins are also persistent and will even spawn on Peaceful difficulty, despite being monsters, as the mobs spawned from ocean ruins count as part of the structure and ignore conventional spawning mechanics, leaving the zombie nautilus spawning on Peaceful by itself.^[1]

Types

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. 1-2 Drowned always generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. 1-2 Drowned always generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. 1-3 Drowned always generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding Drowned
`underwater_ruin/big_brick_8` `underwater_ruin/big_cracked_8` `underwater_ruin/big_mossy_8`	A chunk-sized structure with not much height, looks similar to a floorplan of a large building. Remnants of wooden floors are present. These 3 generate as an integrated whole. 1-2 Drowned always generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. A Drowned has a chance to generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. 1-2 Drowned have a chance to generate here.	30–39 Gravel 9 in total Stone Bricks, Cracked, Mossy 6–10 Mossy Cobblestone 2 Magma Block 1 Chest (random loot) 0–2 Drowned Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. 1-2 Drowned have a chance to generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. A Drowned has a chance to generate here.	37–39 Gravel 35 in total Stone Bricks, Cracked, Mossy 9 Polished Granite 8 Chiseled Stone Bricks 1 Chest (random loot) 0–1 Drowned Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. 1-4 Drowned have a chance to generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. A Drowned has a chance to generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding 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. A Drowned has a chance to generate here.	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 Zombie Nautilus - Has a chance of spawning alongside a trident-wielding Drowned

Loot

In Java Edition, each big underwater ruins chest contains items drawn from 3 pools, with the following distribution:

Item	Stack Size			Weight			Chance	Avg. per chest	Avg. # chests to search
Item	2–8×	1×	1×	2–8×	1×	1×	Chance	Avg. per chest	Avg. # chests to search
Nothing^[A]	—	—	1	—	—	¹⁴⁸⁄₁₈₅	80.0%	0.800	1.2
Coal	1–4	—	—	¹⁰⁄₃₃	—	—	78.9%	3.788	1.3
Wheat	2–3	—	—	¹⁰⁄₃₃	—	—	78.9%	3.788	1.3
Gold Nugget	1–3	—	—	¹⁰⁄₃₃	—	—	78.9%	3.030	1.3
Buried Treasure Map^[B]	—	1	—	—	¹⁰⁄₂₃	—	43.5%	0.435	2.3
Stone Spear	1	—	—	²⁄₃₃	—	—	26.3%	0.303	3.8
Enchanted Book^[C]	—	1	—	—	⁵⁄₂₃	—	21.7%	0.217	4.6
Enchanted Fishing Rod^[C]	—	1	—	—	⁵⁄₂₃	—	21.7%	0.217	4.6
Emerald	1	—	—	¹⁄₃₃	—	—	14.1%	0.152	7.1
Copper Nautilus Armor	—	—	1	—	—	²⁰⁄₁₈₅	10.8%	0.108	9.2
Iron Nautilus Armor	—	—	1	—	—	¹⁰⁄₁₈₅	5.4%	0.054	18.5
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
Golden Nautilus Armor	—	—	1	—	—	⁵⁄₁₈₅	2.7%	0.027	37.0
Diamond Nautilus Armor	—	—	1	—	—	²⁄₁₈₅	1.1%	0.011	92.5

In Bedrock Edition, each big underwater ruins chest contains items drawn from 3 pools, with the following distribution:

Item	Stack Size			Weight			Chance	Avg. per chest	Avg. # chests to search
Item	2–8×	1×	1×	2–8×	1×	1×	Chance	Avg. per chest	Avg. # chests to search
Nothing^[A]	—	—	1	—	—	⁹²⁵⁄₁₁₁₀	83.3%	0.833	1.2
Coal	1–4	—	—	¹⁰⁄₃₃	—	—	78.9%	3.788	1.3
Wheat	2–3	—	—	¹⁰⁄₃₃	—	—	78.9%	3.788	1.3
Gold Nugget	1–3	—	—	¹⁰⁄₃₃	—	—	78.9%	3.030	1.3
Buried Treasure Map^[B]	—	1	—	—	¹⁰⁄₂₃	—	43.5%	0.435	2.3
Stone Spear	1	—	—	²⁄₃₃	—	—	26.3%	0.303	3.8
Enchanted Book^[C]	—	1	—	—	⁵⁄₂₃	—	21.7%	0.217	4.6
Enchanted Fishing Rod^[C]	—	1	—	—	⁵⁄₂₃	—	21.7%	0.217	4.6
Emerald	1	—	—	¹⁄₃₃	—	—	14.1%	0.152	7.1
Copper Nautilus Armor	—	—	1	—	—	¹⁰⁰⁄₁₁₁₀	9.0%	0.090	11.1
Iron Nautilus Armor	—	—	1	—	—	⁵⁰⁄₁₁₁₀	4.5%	0.045	22.2
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
Golden Nautilus Armor	—	—	1	—	—	²⁵⁄₁₁₁₀	2.3%	0.023	44.4
Diamond Nautilus Armor	—	—	1	—	—	¹⁰⁄₁₁₁₀	0.9%	0.009	111.0

↑ ^a ^b 'Nothing' does not refer to the chance of an empty chest. Instead, it refers to the chance that the random loot generator does not add any loot on a single roll.
↑ ^a ^b If a target cannot be found within a reasonable distance, the map is discarded.
↑ ^a ^b ^c ^d All enchantments are equally probable, including treasure enchantments (except Soul Speed, Swift Sneak, and Wind Burst), and any level of the enchantment is equally probable.

In Java Edition, each small underwater ruins chest contains items drawn from 3 pools, with the following distribution:

Item	Stack Size			Weight			Chance	Avg. per chest	Avg. # chests to search
Item	2–8×	1×	1×	2–8×	1×	1×	Chance	Avg. per chest	Avg. # chests to search
Coal	1–4	—	—	¹⁰⁄₃₀	—	—	82.1%	4.167	1.2
Wheat	2–3	—	—	¹⁰⁄₃₀	—	—	82.1%	4.167	1.2
Nothing^[A]	—	—	1	—	—	¹⁴⁸⁄₁₈₅	80.0%	0.800	1.2
Rotten Flesh	1	—	—	⁵⁄₃₀	—	—	57.1%	0.833	1.8
Buried Treasure Map^[B]	—	1	—	—	⁵⁄₁₂	—	41.7%	0.417	2.4
Enchanted Fishing Rod^[C]	—	1	—	—	⁵⁄₁₂	—	41.7%	0.417	2.4
Stone Axe	1	—	—	²⁄₃₀	—	—	28.5%	0.333	3.5
Stone Spear	1	—	—	²⁄₃₀	—	—	28.5%	0.333	3.5
Emerald	1	—	—	¹⁄₃₀	—	—	15.4%	0.167	6.5
Copper Nautilus Armor	—	—	1	—	—	²⁰⁄₁₈₅	10.8%	0.108	9.2
Leather Tunic	—	1	—	—	¹⁄₁₂	—	8.3%	0.083	12.0
Golden Helmet	—	1	—	—	¹⁄₁₂	—	8.3%	0.083	12.0
Iron Nautilus Armor	—	—	1	—	—	¹⁰⁄₁₈₅	5.4%	0.054	18.5
Golden Nautilus Armor	—	—	1	—	—	⁵⁄₁₈₅	2.7%	0.027	37.0
Diamond Nautilus Armor	—	—	1	—	—	²⁄₁₈₅	1.1%	0.011	92.5

In Bedrock Edition, each small underwater ruins chest contains items drawn from 3 pools, with the following distribution:

Item	Stack Size			Weight			Chance	Avg. per chest	Avg. # chests to search
Item	2–8×	1×	1×	2–8×	1×	1×	Chance	Avg. per chest	Avg. # chests to search
Nothing^[A]	—	—	1	—	—	⁹²⁵⁄₁₁₁₀	83.3%	0.833	1.2
Coal	1–4	—	—	¹⁰⁄₃₀	—	—	82.1%	4.167	1.2
Wheat	2–3	—	—	¹⁰⁄₃₀	—	—	82.1%	4.167	1.2
Rotten Flesh	1	—	—	⁵⁄₃₀	—	—	57.1%	0.833	1.8
Buried Treasure Map^[B]	—	1	—	—	⁵⁄₁₂	—	41.7%	0.417	2.4
Enchanted Fishing Rod^[C]	—	1	—	—	⁵⁄₁₂	—	41.7%	0.417	2.4
Stone Axe	1	—	—	²⁄₃₀	—	—	28.5%	0.333	3.5
Stone Spear	1	—	—	²⁄₃₀	—	—	28.5%	0.333	3.5
Emerald	1	—	—	¹⁄₃₀	—	—	15.4%	0.167	6.5
Copper Nautilus Armor	—	—	1	—	—	¹⁰⁰⁄₁₁₁₀	9.0%	0.090	11.1
Leather Tunic	—	1	—	—	¹⁄₁₂	—	8.3%	0.083	12.0
Golden Helmet	—	1	—	—	¹⁄₁₂	—	8.3%	0.083	12.0
Iron Nautilus Armor	—	—	1	—	—	⁵⁰⁄₁₁₁₀	4.5%	0.045	22.2
Golden Nautilus Armor	—	—	1	—	—	²⁵⁄₁₁₁₀	2.3%	0.023	44.4
Diamond Nautilus Armor	—	—	1	—	—	¹⁰⁄₁₁₁₀	0.9%	0.009	111.0

↑ ^a ^b 'Nothing' does not refer to the chance of an empty chest. Instead, it refers to the chance that the random loot generator does not add any loot on a single roll.
↑ ^a ^b If a target cannot be found within a reasonable distance, the map is discarded.
↑ ^a ^b All enchantments are equally probable, including treasure enchantments (except Soul Speed, Swift Sneak, and Wind Burst), and any level of the enchantment is equally probable.

Suspicious blocks

In Java Edition and Bedrock Edition, each cold ocean ruins suspicious gravel contains 1 item stack, with the following distribution:

Item	Stack Size	Weight	Chance	Avg. per block	Avg. # blocks to brush
Coal	1	²⁄₁₅	13.3%	0.133	7.5
Emerald	1	²⁄₁₅	13.3%	0.133	7.5
Wheat	1	²⁄₁₅	13.3%	0.133	7.5
Wooden Hoe	1	²⁄₁₅	13.3%	0.133	7.5
Gold Nugget	1	²⁄₁₅	13.3%	0.133	7.5
Blade Pottery Sherd	1	¹⁄₁₅	6.7%	0.067	15.0
Explorer Pottery Sherd	1	¹⁄₁₅	6.7%	0.067	15.0
Mourner Pottery Sherd	1	¹⁄₁₅	6.7%	0.067	15.0
Plenty Pottery Sherd	1	¹⁄₁₅	6.7%	0.067	15.0
Iron Axe	1	¹⁄₁₅	6.7%	0.067	15.0

[nothing-2] 'Nothing' does not refer to the chance of an empty chest. Instead, it refers to the chance that the random loot generator does not add any loot on a single roll.

[explorer-map-3] If a target cannot be found within a reasonable distance, the map is discarded.

[enchant-randomly-4] All enchantments are equally probable, including treasure enchantments (except Soul Speed, Swift Sneak, and Wind Burst), and any level of the enchantment is equally probable.

[nothing-5] 'Nothing' does not refer to the chance of an empty chest. Instead, it refers to the chance that the random loot generator does not add any loot on a single roll.

[explorer-map-6] If a target cannot be found within a reasonable distance, the map is discarded.

[enchant-randomly-7] All enchantments are equally probable, including treasure enchantments (except Soul Speed, Swift Sneak, and Wind Burst), and any level of the enchantment is equally probable.

[1]

[A]

[B]

[C]

[A]

[B]

[C]


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

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.

Java Edition
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 within underwater ruins.
1.16	20w06a	Underwater ruins are now much less common.
1.20	23w12a	Cold underwater ruins now generate with suspicious gravel.
1.21.11	25w41a	Added zombie nautiluses, which can spawn on underwater ruins.
		Ocean ruin chests can now contain stone spears.
		Ocean ruin chests can now contain copper, iron, golden and diamond nautilus armor.

Bedrock Edition
1.4.0	beta 1.2.20.1	Added underwater ruins.
1.19.80 Experiment Next Major Update	Preview 1.19.80.21	Cold underwater ruins now generate with suspicious gravel.
1.21.130	Preview 1.21.130.20	Added zombie nautiluses, which can spawn on underwater ruins.

Legacy Console Edition
Xbox 360	Xbox One	PS3	PS4	PS Vita	Wii U	Switch
TU69		1.76	1.76	1.76	Patch 38		Added underwater ruins.

Cold Ocean Ruins

Generation

Structure

Mobs

Types

Loot

Suspicious blocks

Data values

Achievements

History

Teaser

Java Edition

Bedrock Edition

Legacy Console Edition

Minecraft Education

Issues

Trivia

Gallery

References

External links

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