The Royal Navy, Air Force and Marines worked together in the bunker to monitor enemy convoys and “wolf packs” of submarines, which threatened to destroy Britain in the earliest stages of the war.
The goings-on in the bunker played a huge part in the victory of the Battle of the Atlantic, having successfully imported supplies into wartime Britain from the sea.
Victory at the Battle of the Atlantic was essential for Britain to survive; the invasion of Europe in 1944, which instigated the beginning of the end for Germany, could not have occurred if the U-Boats had succeeded during the Battle of the Atlantic.
Only after the war did Winston Churchill confess that it was the Atlantic that concerned him the most: “The only thing that really frightened me during the war was the U-boat peril.”
The greatest challenge, Churchill felt, was to manage strategy around the Atlantic shipping routes which required “statistics, diagrams and curves unknown to the nation, incomprehensible to the public.”