"Superman Returns" extends the crystalline Kryptonian technology from "Superman" which allowed young Clark Kent to "grow" the Fortress of Solitude. Kryptonian crystals are able to grow huge land masses and incorporate the properties of the surrounding environment; a sliver taken from one of the crystals used to test the theory causes Lex Luthor's basement to be filled with a huge crystal structure. Growing land in this manner causes widespread power failure. Lex Luthor later combines one of the crystals with kryptonite and shoots it into the ocean, creating a new land mass he calls "New Krypton". Superman uses his heat vision to get under the crust of the island and throws it into space, including the other crystals that Luthor wanted to use to set up a real estate scam, despite the warning that many people would die from the massive tsunamis and earthquakes that the crystals would create.