Much too small. Using Wikipedia's figures: volume of Qattara Depression = 1,213 cubic kilometres, volume of Greenland ice sheet = 2,850,000 cubic kilometres. An

Much too small. Using Wikipedia's figures: volume of Qattara Depression = 1,213 cubic kilometres, volume of Greenland ice sheet = 2,850,000 cubic kilometres. And the project is only useful as a long-term power source if the contents evaporate leaving space for renewed inflow, i.e. it only sequesters a fraction of its volume.