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If you enjoy reading about mega projects then I would recommend Engineers' Dreams by Willy Ley. It’s an older book on large scale civil engineering proposals such as draining the Mediterranean sea, creating an inland sea in the Sahara, and irrigating the Jordan valley.

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creating an inland sea in the Sahara

Could this be part of an answer to massive sea level rise?

Wouldn't the water just continously evaporate only to, with high probability, precipitate back to the "global" ocena system or its tributaries?

You could make the see less salty though, over a sufficiently long time and get a WHOLE LOT of rock salt.

Napkin math says about 343km^3/year of water to contend with, and the Panama canal work took 35 years to move about 0.2km^3 of earth, about 0.006km^3/year.

As a layperson it seems to me you'd need to channel a vast area already below sea level (3500km^2 at ~100m deep?) to put a dent in the rise.

Again, napkin math. Reuters claims "75.6 trillion gallons of water added to the ocean each year" and a Panama canal history page says the French dug 30M cubic yards and the Americans dug 238M.

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