SG-1 first discovered the technology when Col. Jack O'Neill, having downloaded the Ancient database into his mind for a second time, led the team to the planet Proclarush Taonas and retrieved a ZPM from an abandoned Ancient outpost.
SG-1 first discovered the technology when Col. Jack O'Neill, having downloaded the Ancient database into his mind for a first time, builds a ZPM from scratch and uses it in order to visit the asgard world. Another time, led the team to the planet Proclarush Taonas and retrieved a ZPM from an abandoned Ancient outpost.