Minecraft Java 1.21 Mods
Browse 750 free mods for Minecraft Java 1.21 — popular picks include Sea of Steves, Space's Sponge Crafting Recipe, Oceanic sword remastered.
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Sea of Steves
Boat battle plugin for Minecraft servers
Space's Sponge Crafting Recipe
Adds a vanilla-friendly, ocean-themed crafting recipe for the uncraftable Sponge block.

Oceanic sword remastered
Adds a mythical pirate blade to your world allowing you to harness the power of the seas.
Biome Compatibility Patch
Renames content to preserve compatibility between the 4 major biome mods as well as Terralith, Environmental, Atmospheric, Autumnity, Upgrade Aquatic, Wetland Whimsy, and Jaden's Nether Expansion.
Their Name Is Blåhaj
Renames the Blåhaj mod's Soft Toy Shark to Blåhaj
RC GameShark (Cobblemon)
RC GameShark is a client-side tracking mod for Cobblemon that helps you locate and hunt specific Pokémon more efficiently. It scans nearby spawns and provides real-time visual and audio cues to guide you directly to them.
One Island
Start alone on a small island in an endless ocean. Gather resources, build, explore, and survive with what the sea provides.
Soggy Cat Compasses and Clock
Turns the default Minecraft compasses and clock into Shark (soggycat)
Puris Eco Ocean
This is a passion project from zi_jian. It adds 10 brand-new ocean biomes, 29 new entities, along with corresponding items, materials and decorative blocks. I'm still a beginner mod developer, so feel free to report any bugs you encounter.
Waterbed
Introduces a bed that lets you sleep underwater
Better Turtle Helmets
Reworks the turtle helmet to provide continous water breathing underwater at the cost of losing durablility overtime.
better mob : sea expansion
Better Mob: Sea Expansion transforms Minecraft oceans with unique creatures like Whales, Lobsters, Deep Watchers, Coral Golems, and Jellyfish, creating deeper exploration, dangerous encounters, and unforgettable underwater adventures.
oceans biomes
Create worlds made entirely of oceans with a simple configuration screen. Choose the ocean biome, tweak depth, and enable or disable islands and ocean structures.
Warm Ocean Only World (No Sea Structures)
Turns the Overworld into an infinite warm ocean with no islands or sea structures!
Blåhaj Lite
Blåhaj Neoforge port, Remove Pride Sharks
Sea Bunny´s
Adds Adorable Sea Bunny´s to Minecraft ❤️
Waterlogged Beds
Allow beds to be waterlogged for more immersive underwater builds
Redstone Underwater
Redstone can now be waterlogged!
Exodus 14:27
Fixes MC-278019 bug to restore sea level in superflat worlds.
Sea-Through Boats
Explore the depths like never before with this crystal-clear glass-bottom boat resource pack. See underwater wonders as you glide across the ocean, bringing new life and clarity to your Minecraft adventures.
Aqua Forge
This is a data pack that will generate an ocean biomes only world.
Secret Rooms
Secret buildings with rare loot underground, underwater, and in the End
Sea of Bombs
Adds the Fire, & Blast Bombs and the Bone Caller from Sea of Thieves
Remove water droplets
Does what it says. Removes all of those pesky water droplets in underwater bases.
No Sprint-Swimming
Disables fast movement in the water in survival and on servers, making oceans daunting again
fishies in the sea
modpack centered around building with some adventure aspects
Raft World
Start on a tiny raft in an endless ocean. Survive and rebuild the world.
Primordial Sea
Fishing Resource Pack
Water Depth Fog
Underwater fog gets darker and closer the deeper you dive — a purely visual atmosphere mod for deep-ocean gameplay. Client-side.
Aquarius Trilogy
Add a new aquatic dimension featuring some refreshing biomes and structures
Seagrass Overgrowth
Seagrass Overgrowth brings the ocean to life by replacing plain seagrass with overgrown aquatic remnants.
Better Sea Lantern Crafting
This datapack/mod allows you to craft Sea Lanterns in a better way
Gura Totem
Totem of Gura A playful and mischievous shark spirit, this totem embodies curiosity, agility, and oceanic charm.
Hammerheads
Replaces dolphins with sharks

Simple Mermaid Tails
This Mod adds Mermaid Tails, thats it. This is kinda a fork from my Mako Mermaids Mod but without the Powers etc.
Sharky's Additions
Large Collection of Resource Packs and Nice Aesthetic Changes