Quick Tutorial Video https://youtu.be/DL9YoKW75rA

Tsunami Sandbox

Summon a massive wave of water or lava and watch it sweep across your Minecraft world. Tsunami Sandbox is a command-driven mod for creative experiments, flood challenges, map making, and server events. Choose the wave's height, speed, width, and travel distance with a single command.

Start a wave

Stand where you want the wave to pass, then face the direction it should come from:

/wave spawn water 24 8

This creates a water wave 24 blocks high, with a requested speed of 8 blocks per second. The default width is 513 blocks. A five-second warning displays Tsunami Approaching! and plays an alarm before the wave begins.

The wave has a stepped, sloping front: lower layers lead the upper layers, with one block of setback for every two blocks of height. It leaves real water or lava behind as it moves.

By default, the wave starts at one edge of the effective render range, passes through your original position, and continues to the opposite edge. The range uses the smaller of your reported client render distance and the server view distance, from 2 to 32 chunks. It is fixed when summoned; the wave does not chase you. Fog and chunk loading can affect where the edge appears.

Command reference

/wave spawn <water|lava> <height> <speed> [width] [distance]

Angle brackets mean required values. Square brackets mean optional values. Do not type the brackets. Commands and options are lowercase.

Value	Meaning	Allowed range / default
water or lava	The fluid to use	Required
height	Height in blocks above your feet when summoned	1-128
speed	Requested movement speed in blocks per second	0.25-40
width	Width of the wave in blocks	1-2,049; default 513
distance	Starting distance and distance beyond the target	8-1,024; automatic render range when omitted

Examples:

/wave spawn lava 12 4
/wave spawn water 48 12 1025
/wave spawn water 16 6 513 192

The first summons a lava wave. The second makes a taller, wider water wave. The third starts a water wave 192 blocks away and sends it 192 blocks beyond the target. An explicit distance requires specifying width first.

/wave status
/wave cancel

status reports progress and endpoint distances. cancel stops further wave placement, including during the warning period. Cancellation does not remove water or lava already placed, undo damage, or stop normal fluid flow.

Spawning, status, and cancellation require cheats in single player or operator permission level 2 on a server. Only one wave can be active per server at a time. Use /wave to display command help.

Notification settings

/wave warning off
/wave warning on
/wave finished off
/wave finished on

warning controls your on-screen approaching message. The alarm still plays when this text is disabled. finished controls the completion chat message for waves you summon. Both settings default to on and are saved per player in each world. Everyone can change their own notification settings, even without operator access.

Use /wave warning or /wave finished without an option to check its current setting. The options are only on and off.

How flooding works

The mod places real fluid blocks into air and replaceable blocks while preserving solid blocks and block entities during placement. Buildings can obstruct the flood, and water or lava then follows Minecraft's normal fluid behavior. Lava can start fires, and fluids can damage entities and vulnerable blocks or spread beyond the planned area. Water waves are rejected where water evaporates, such as the Nether.

Only loaded chunks are flooded. Unloaded positions are skipped rather than forcing terrain to load, so actual flooded width and travel coverage depend on loaded chunks. Large waves may run slower than the requested speed. Active waves stop on a server restart, while fluids already placed remain in the world.

Use a backup or a separate creative world for experiments. There is no undo command.