The plan was an enlargement of Operation Whale ("Unternehmen Wal" in German). Planning took place in the context of American troops landing in Northern Ireland 26 January 1942, and Hitler's immediate fears surrounding this.
Operation Whale ("Unternehmen Wal") was a larger version of the initial plan. The planning for this operation took place against the context of American forces landing in Northern Ireland on January 26, 1942, and Hitler's intense apprehensions about this event.