After that he began to burrow up into it from below. The right way to do, he knew, was to have his doorway under water and dive down to it. Other winters he had done this and had given the water a loud slap with his tail as he dived. Now there was not enough water to dive into, and when he tried slapping on it his tail went through to the ditch bottom and got muddy. He had to fix the doorway as best he could, and then he ate out enough of the inside of his house to make a good room and poked a small hole through the roof to let in fresh air.