Comment saltwater intrusion (Score 4, Interesting) 49
We already have a problem with wells in Florida getting salty, because when you lower the pressure of the aquifer by pumping millions of gallons out of it, the surrounding saltwater from the ocean flows in. It seems like this would happen even faster with an aquifer under the ocean if you start pumping the water out. I can't see this being a source of freshwater for very long.