"SDI"@en . . . "Space flight"@en . "__NOEDITSECTION__ Superconductor is the one of the second to last Technologies unlocked. It allows you to research Future Technology and build an SDI Defense."@en . "Future technology"@en . "__NOEDITSECTION__ Superconductor is the one of the second to last Technologies unlocked. It allows you to research Future Technology and build an SDI Defense."@en . "Superconductor (CivRev)"@en .