How to make good TnT cannons.

So, today we'll teach you how to make good TnT cannons.This is really important for raids and really fun to play with friends, and if you learn this you could even make your own cannon.  :D

So first you need materials:

- Blocks (It could be any block)
- 1 slab     (It could be any slab)
- 64 TnT blocks(Of course, obviously)
- redstone (repeaters,dust)
- levers or buttons
- 1 water  bucket
- Dispensers(optional)

Now you need to build it, to do this, first place the blocks like this:

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Then you put TnT in the water(without putting anything in the source of water),also put red stone and repeaters to turn the TnT on. :D

Then just press the button and it will fire