Vasa was a big Swedish warship. The ship was built from 1626 to 1628. The same year "Vasa" was ready outside Stockholm, but sank by accident on her maiden voyage (first trip). "Vasa" sank because she was too heavy on top. Those who built her knew that she had problems, but they didn't dare say that to the Swedish king Gustavus Adolphus. He was not in Sweden when "Vasa" was built and he wanted her to go fight in the Thirty Years' War as soon as possible. There was a hearing about why "Vasa" sank, but no one was found guilty or judged for her sinking.