This cannon blows up in water! it fuses sand and tnt together to blow up water walls! works everytime! make sure to suscribe on Youtube! Make sure if you have any problems you comment! We are currently making a smaller version! Doesnt need mods or anything it works in vanilla! Can use from 7 to 64 tnt! Rate Comment and Suscribe! Were making many more videos! www.youtube.com/watch?v=KtY_SxVUddM&feature=plcp