A hundred years ago this month, the February 1920 issue of Electrical Experimenter detailed this plan which surfaces from time to time: To get hydroelectric power by piping water from the Mediterranean Sea to the Dead Sea, which lies 1400 feet below sea level.
The necessary tunnel would be 37 miles long, and would pass about 2500 feet under Jerusalem. According to the magazine, the plan would bring electric lights and electric trolleys to the Holy Land.
More information about the various proposals for this project over the years can be found at Wikipedia.