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Underwater TNT is a block that can be used by the player to initiate a controlled explosion underwater.



Underwater TNT can be broken instantly using any tool, or without a tool. However, primed underwater TNT cannot be broken, as it is an entity.


Ingredients Crafting recipe
Sodium +


Main article: TNT § Usage

Underwater TNT blocks can be activated the same way as a normal TNT block.


Once activated, it explodes like a normal TNT block. However, unlike the TNT block, it can destroy blocks underwater. It can still explode in the air, although it does not work in lava. Underwater TNT has the same delayed detonation rate as normal TNT.



SoundSourceDescriptionResource locationVolumePitch
BlocksOnce the block has brokendig.grass0.70.8-1.0
BlocksWhen the block is placeddig.grass0.80.8-1.0
BlocksWhile the block is in the process of being brokenhit.grass0.30.5
PlayersFalling on the block with fall damagefall.grass0.41.0
PlayersWalking on the blockstep.grass0.31.0
PlayersJumping from the blockjump.grass0.111.0
PlayersFalling on the block without fall damageland.grass0.211.0


SoundSourceDescriptionResource locationVolumePitch
BlocksWhen an underwater TNT block is litrandom.fuse1.01.0
BlocksWhen an underwater TNT block explodesrandom.explode4.01.0

Data values[]


NameIdentifierNumeric ID FormItem ID[i 1]Translation key
Underwater TNTtnt46Block & Giveable Item[i 2]Identical[i 3]tile.underwater_tnt.name
  1. ID of block's direct item form, which is used in savegame files and addons.
  2. Available with /give command.
  3. The block's direct item form has the same id as the block.
NameIdentifierNumeric ID Translation key
Primed Underwater TNTtnt65entity.tnt.name

Block state[]

NameMetadata Bits Default value Allowed valuesValues for
Metadata Bits
allow_underwater_bit0x2false false0This is normal TNT.
true1This is Underwater TNT.
explode_bit0x1false false0Hitting the TNT block breaks it, dropping it as an item that can be picked up.
true1Hitting the TNT block causes it to ignite and then explode.


  • The inclusion of sodium is a reference to elemental sodium's explosive reaction with water. All alkaline metals react with water violently to form hydrogen gas and a hydroxide. The heat generated often ignites the gas.


Bedrock Edition
1.4.0beta TNT BE1 Added underwater TNT.
Education Edition
1.0.27Underwater TNT BE1 Added underwater TNT.


Issues relating to "Underwater TNT" are maintained on the bug tracker. Report issues there.