Re: It makes sense if you abandon a sense of proportion
There was an even more ambitious land relamation scheme than Atlantropa supposedly devised around the same time, called the "North Sea Drainage Project". This project was going to recover 100 thousand square miles of land from the North Sea joining the east coast of England up with continental Europe.
The scheme was supposedly devised by a group of "eminent English scientists" according to the US magazine "Modern Mechanics" in 1930. However there is apparently no record of the proposed scheme other than its publication in Modern Mechanics, which raises the suspicion that the magazine may have just made the story up.
Building dams in the North Sea does have one big advantage over the Mediterranean Sea in that the sea is much shallower, I think the area of sea identified for the North Sea Drainage Project is generally less than 150 feet deep whereas the sea depth at the Straits of Gibraltar, according to Wikipedia, varies from 980 to 2950 feet.