Work began in May 1940 and the barriers were completed in September 1944, but were not officially opened until 12 May 1945, four days after the end of World War II in Europe.
O traballo comezou en maio de 1940 e as barreiras completáronse en setembro de 1944, pero non se abriron oficialmente ata o 12 de maio de 1945, catro días despois do final da Segunda Guerra Mundial en Europa.