<page_title> List of most successful U-boat commanders </page_title> <section_title> World War II </section_title> <table> <cell> 21 <col_header> # </col_header> </cell> <cell> Günther Hessler <col_header> Commander </col_header> </cell> </table>
Günther Hessler was the twenty-first overall most successful U-boat commanders of World War II by tonnage sunk.