High Quality Content by WIKIPEDIA articles! Operation Haifisch (Shark) was a German codename for the cover operation against Great Britain in World War II, elaborated by Wilhelm Keitel. Designated to begin in April, 1941, it was aimed to strike at England's southern coast in four different places between Folkestone and Worthing. The Kriegsmarine's main task was to ferry the invasion forces after loading them at major ports between Cherbourg and Rotterdam. Operation Sea Lion (German: Unternehmen Seelöwe) was Nazi Germany's plan to invade England during World War II, beginning in 1940. To have had any chance of success, however, the operation would have required air supremacy over the English Channel. With the German defeat in the Battle of Britain, Sea Lion was postponed indefinitely on 17 September 1940 and never carried out.