Boat really floats

This boat really does float. It can go in a depth of 40cm deep. Or higher. It cannot be hit by a little wave or it will start to fall over. I have designed this so it's gun cane move over 5 directions. It can go all the way around and it can go up and down. This ship can not move in the water. But I wanted to design something to help it. The little boat attached to it can float too at a depth of 20cm or lower. It is 26cm long and 13cm tall. It can not go in shallow water. Thanks for reading this.