Atlantropa

Atlantropa, also referred to as Panropa, was a gigantic engineering and colonization project devised by the German architect Herman Sörgel in the 1920s and promulgated by him until his death in 1952. Its central feature was a hydroelectric dam to be built across the Strait of Gibraltar, which would have provided enormous amounts of hydroelecticity and would have led to the lowering of the surface of the Mediterranean Sea by up to 200 metres, opening up large new lands for settlement, for example in a now almost totally drained Adriatic Sea.

Sörgel saw his scheme, projected to take over a century, as a peaceful European-wide alternative to the Lebensraum concepts which later became one of stated reasons for Nazi conquest of new territories. Atlantropa would provide land and food, employment, electric power, and most of all, a new vision for Europe and neighbouring Africa.

Atlantropa at Wikipedia