A little follow-up: 1) the proposal suggests incompatible things: filling the sea, generating electricity from elevation difference (then you shouldn't fill it

A little follow-up: 1) the proposal suggests incompatible things: filling the sea, generating electricity from elevation difference (then you shouldn't fill it), and desalinating the water with the energy. If I understand correctly, desalination is very energy-intensive, so it's a big question whether a dam of 60m is enough to desalinate its own stream of water. 2) if it's just a pipe that lets water in, this may be like Garabogazköl gulf in Caspian sea, with salinity levels as high as in the dead sea -- and note that its inflow is 200m-wide canal, not a man-made 10 or more pipe. https://en.wikipedia.org/wiki/Garabogazk%C3%B6l https://en.wikipedia.org/wiki/Garabogazk%C3%B6l 3) costs of digging a trench are at least quadratic to its depth. To have it stable, the trench must have slopes at sides no more than 15%. This means the area of cross-section is depth^2 / 0.15. If it's just 100m, the cross-section is 66K m^2. If it's 200m, it's 266K m^2. At 100m depth, every km of canal is 0.06 km^3 of ground to move. At 200m, it's already 0.26 km^3 -- a quarter cubic kilometer per kilometer of length! Oh, that's why the engineers thought of nuclear blasts here. So, unless humanity is ready to use nuclear weapons that massively, this idea is just a dream contradicting itself.