Bob Lazar's gravity drive - When you then shut off the gravity generators, the stone (or spacecraft) follows that stretched rubber back to its point. There’s no linear travel through space; it actually bends space and time and follows space as it retracts
Bob-Lazar - Inventor of the Hydrogen Powered Corvette - Consider this-->Lazar's stories have garnered considerable media attention and controversy. Lazar's story has its supporters and skeptics, including Stanton Friedman, a ufologist who claimed to have looked into Lazar's background. Friedman claims that Lazar is a fraud and lied about attending MIT and cannot even remember the year he obtained his masters in MIT. No professors at MIT remember Bob Lazar or have any photos of him.