Live Flood

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Turn your world into a rising flood survival challenge. Watch the streets disappear underwater, turn rooftops into islands, and keep building higher before the next rise.

Live Flood fills empty space below a height you choose while you play. Nearby areas flood quickly from the top down, while other loaded chunks fill upward in the background. Explore somewhere new, and the flood follows.

Set a schedule to keep the water rising, or control everything yourself. Want something stranger than water? Flood the world with lava, iron, or another block.

Make the flood your own

• Choose a flood height, or set it directly beneath your feet.
• Schedule rises by Minecraft days and choose how many blocks each rise adds.
• Change the fill material whenever you want.
• Keep different materials in layers, or replace previous flood blocks with your latest choice.
• Lower the flood to gradually remove tracked flood blocks above the new level.
• Build and drain an underwater base without scheduled rises automatically refilling its cleared rooms.
• Automatically change flooded areas into river, ocean, or deep ocean biomes based on water depth and the original climate.

Getting started

Flood height is an exclusive boundary: /flood 80 fills through block layer 79. Using a lower height also starts removing tracked flood blocks above that boundary.

A world that remembers

Settings, countdowns, and flood progress save with your world. Sleeping advances the schedule, and each rise is announced in global chat. Singleplayer offline time does not count.

Multiplayer flooding works around every player, with separate settings for each dimension. Commands that change the flood require cheats or operator permissions.

Water biomes

Biome cleanup is enabled by default and runs last, after other flood work has settled. Shallow water becomes river, deeper water becomes ocean, and water at least 30 blocks deep becomes deep ocean. Climate determines the warmer, colder, or frozen variants.

These are actual biome changes, including their aquatic spawn pools. Supported vanilla aquatic mobs can use the raised flood surface for spawning, while normal spawn caps and player-distance rules still apply. Draining the area or disabling biome cleanup gradually restores recorded original biomes.

Before you flood

Back up worlds you care about. The initial flood fills caves and empty building interiors, including sealed rooms. Later rises preserve spaces already scanned; /flood rescan deliberately allows those spaces to fill again.

Removal and replacement rely on recorded flood placements. Water placed by older versions, pre-existing natural water, and some ordinary world effects cannot be completely undone.

Work is spread across ticks, but large floods and fluid updates can still cause lag. Only loaded chunks are processed—the mod never loads the entire world at once.

Minecraft 1.20.1 · Forge 47.x · Java 17