To Sky. Make a large network of collectors. Put Mortars near the hole by the pools, and check the elevation levels. When it's high, have the mortars activated and blast the pool until it gets to a low point, and then deactivate it. Then take your time slowly going near the creeper and blast it away.
 "Creeper World Training Sim"){kind=icon}
 "Enigmata 2: Genu's Revenge"){kind=icon}