Minecraft Java 1.21 Mods
Browse 40 free mods for Minecraft Java 1.21 — popular picks include Create: Stranded at Sea, Seaopolis Submerged 2, One Survival Island.
Updated daily
Create: Stranded at Sea
An ocean survival, centered around create automation, adventure, and a fully integrated economy system.
Seaopolis Submerged 2
An ocean based survival questing modpack. Back for 1.21.1
One Survival Island
Datapack that creates a Single Survival Island in an Infinite Ocean World
100 Days on a Desert Island
Survive 100 days in Hardcore on a tiny island with minimal resources and endless ocean
Shark Totem of Undying
The Shark Totem resource pack transforms the totem of undying into a shark, offering Minecraft players an aesthetic that embodies the raw power and survival instincts of one of the ocean’s most revered predators.
Abandoned Rig
An ocean-themed apocalyptic survival modpack.
Atlantis: Fire Beneath Water
Classic underwater survival challenge map, now upgraded to Datapack | 经典水下生存地图数据包重制版《亚特兰蒂斯：水寒火暖》
Create Simulated: End Sea Everywhere
Bare bones datapack that adds the End Sea from create simulated to other dimensions. Useful for Skyblock style modpacks.
OceanBlock - Skyblock Reinvented
Skyblock, but in the ocean
End Sea Everywhere
Bare bones datapack that adds the End Sea from create simulated to other dimensions. Useful for Skyblock style modpacks.
AcidIsland - Toxic SkyBlock
SkyBlock with a deadly twist: the ocean is acid. Survive on your island, but don't fall in the water.
Single Island Generator
A Minecraft world generation mod that adds an Island world type, generating an ocean-only world with one randomly generated survival island.
No Sprint-Swimming
Disables fast movement in the water in survival and on servers, making oceans daunting again
Poseidon - Underwater Survival
Shipwrecked and stranded underwater. Breathe, build, and survive in a fully aquatic island world.
Billy's Origins
Billys Origins is a hardcore player role based modpack with additions and content for every unique Origin. With enhanced sea floors to the stars in the sky you'll never find yourself bored.
Drown Panic
"An immersive mod that enhances survival atmosphere underwater with a wide screen vignette (tunnel vision) and realistic heartbeat sounds when drowning."
Special Potions
Adds new powerful potions with unique abilities like Fire, Ocean, Wind, Warden, Ender, Speed, and Strength effects for survival and PvP gameplay.
Nuclear sewage-核污水
This is a data pack that can be used for island survival, players will get poison and nausea when they touch water, and after drinking the water lung potion, they will be immune to poison and nausea, and of course, players can take a boat without harm!
DrownedOverhaul
Drowned mobs can now grab and drag players underwater. A dangerous new twist to ocean survival!
Item Glow Data Pack (26.2, 1.21.1) – Never Lose Track Of Dropped Items Again
Item Glow Data Pack makes all nearby dropped items glow subtly, helping you easily locate them even in dark caves, forests, or underwater. Whether you're mining, fighting mobs, or just accidentally dropped something valuable, this pack ensures you won't leave anything behind. A perfect quality-of-life addition for any survival playthrough! Enjoy playing this data pack! […]
Create Stranded at Sea Modpack (1.21.1) – Ocean Survival
Create Stranded at Sea Modpack is a Minecraft modpack focused on surviving in an ocean world using Create automation. Build machinery, explore islands, and manage resources with a full progression and economy system. Perfect for both new and experienced players. Features: Create Automation: Use Create and its addons to automate tasks Build machines to gather […]
Seaopolis Submerged 2 Modpack (1.21.1) – A New Generation of Underwater Skyblock
Seaopolis Submerged 2 Modpack is an ocean-based survival and questing modpack for Minecraft. Players are plunged into a fully custom underwater world called Seaopolis, filled with unique terrain, challenges, and surprises. Your journey begins inside a sealed glass sphere deep beneath the waves, where you must fight, build, and innovate to survive in a world […]
Warm Islands Mod (1.21.3, 1.20.1) – Generate Pirate Themed Worlds
Want to play around in a pirate themed world? Want to challenge yourself to a survival experience where no large landmasses are present? If the answer to either is yes, Warm Islands Mod is for you. The worlds you generate with this mod installed generate with warm islands and oceans, and nothing else. This paves […]
Water World Mod (1.21.4, 1.20.1) – Submerged Survival Challenge
In the vanilla game, the sea level is at y-level of 63. This means the topmost layer of water in oceans and rivers will be at Y=63. Water World Mod increases this limit to Y=127. With this mod installed, your entire world will be covered in water, making way for an exciting challenge. When you […]
Can't Touch Water Mod (1.21.8, 1.20.1) – Water Kills On Contact
Can't Touch Water Mod is a fun challenge mod that tests your survival limits. The mod adds a simple new change – water will kill you instantly upon contact. Swimming and ocean exploration are key elements of the survival gameplay. And with this mod installed, those elements of the game are restricted. Features: Adds a […]
Archipelago Data Pack (1.21.4, 1.20.1) – Majestic Islands, Stunning Terrain
Archipelago Data Pack generates a world of breathtaking islands, each with unique terrain and features. Perfect for players who love exploration, survival challenges, or building in scenic, oceanic environments! Enjoy playing this data pack! Features: Archipelago turns you minecraft world into a unique archipelago of islands while also making mountains an shores a bit better! […]
PlasticStrawActivist's Infinite Music Mod (1.21.1, 1.20.1) – Endless Music In Minecraft
PlasticStrawActivist's Infinite Music Mod removes the gaps between tracks, delivering uninterrupted music throughout your gameplay. It also lets you fine-tune the soundtrack by adjusting delays or disabling certain music types. Features: Continuous playback with no forced delays. Set custom delay times for different music types. Enable or disable categories like menu, survival, creative, underwater, or […]
OneWayExchanges
Give an item to a player by right clicking. Nice if on a skyblock or underwater/lava if you can't drop that item.
DS Dragonborn - Cave, Forest & Sea
Adds dragonborn for the 3 default dragons to Dragon Survival
Abyssal Tides Mod (1.21.1, 1.20.1) – Build Underwater Bases in a Vast Ocean
Abyssal Tides Mod introduces a deep ocean dimension built for underwater survival. It fills the world with submerged biomes, sea plants, and custom marine life. You can explore sunken ruins, collect rare sea resources, and fight a powerful ocean boss. The mod focuses on creating a complete aquatic environment for players who want to build […]
Integrated Seven Seas Data Pack (1.21.1, 1.20.1) – Battle Hostile Pirate Ships
Integrated Seven Seas Data Pack overhauls the structures from When Dungeons Arise – Seven Seas. It decorates ship interiors using blocks and items from Create, Quark, Supplementaries, and Farmer's Delight. The data pack adds more monsters inside each vessel and balances chest loot for survival gameplay. Every ship now spawns only in deep ocean waters […]
Subnautica Ember Mod (1.21.8) – Survive Giant Leviathans in the Deep Ocean
Subnautica Ember Mod brings the deep-sea survival of Subnautica into your game. It fills your oceans with new alien creatures, underwater biomes, and hidden dangers. You start in calm waters but must dive into dark caves and deep trenches to find new things. The mod also adds an infection sickness that makes survival harder as […]
Subnautica After Zero Mod (26.1.2, 1.21.1) – Survive the Deep Sea and Uncover
Subnautica After Zero Mod brings the famous underwater survival game into your Minecraft world. It continues the story a few years after the events of Subnautica Below Zero. This mod adds familiar alien fish, special tools, and massive ocean biomes to explore. It is built specifically to work with a custom story map for the […]
Cybernetics Mod (1.21.1) – Upgrade Your Body with Custom Robotic Implants
Cybernetics Mod adds mechanical body parts and futuristic implants to your survival world. It lets you replace your character's limbs and organs with robotic upgrades to gain new abilities. You can become a fast ninja, a strong fighter, or even an underwater explorer depending on the parts you choose. The world also gets new dangers, […]
Feesh Mod (26.2, 1.21.11) – Never Miss a Rare Catch in Hypixel Skyblock Fishing
Feesh Mod brings helpful tools to your Hypixel Skyblock fishing trips. This mod adds trackers, alerts, and chat features so you always know what happens on your screen. It tracks your profits, counts the sea creatures you catch, and warns you when important events happen. You get a cleaner chat box and useful timers right […]
Terrarium by Lynxs Mod (1.21.11, 1.20.1) – Survive on an Accurate Replica
Terrarium by Lynxs Mod lets you explore a massive, pixel-perfect version of Earth right inside your game. It uses real-world elevation and climate data to generate mountains, valleys, and oceans exactly as they exist in real life. You can change the zoom level to control how big the planet gets, from a small survival map […]