I wanted to kill a chicken with tnt in the pool water that I had made, but when the tnt exploded It broke two slab, quartz and netherbrick.
1: Make a hole 3x3x3
2: Line the bottom half slab
3:Putting water into the hole
4: Ask a tnt middle and explode
5: Normally at least half slab is exploded
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The tnt has to be fully in the water to not break blocks. If it's half in the water and half in the air pocket of the slab of course it's going to blow up blocks.