uncompleted U-boat projects
...that four artillery submarines were among many uncompleted U-boat projects planned by Nazi Germany?
...that four artillery submarines were among many  <b id="mwAv4"><a href="./Uncompleted_U-boat_projects" id="mwAv8" rel="mw:WikiLink" title="Uncompleted U-boat projects">uncompleted U-boat projects</a></b> planned by <a href="./Nazi_Germany" id="mwAwA" rel="mw:WikiLink" title="Nazi Germany">Nazi Germany</a>?