Shunt drive was a type of faster-than-light engine which exceeded Warp drive by actually using time travel as a method of transportation through space. (NF comic: "Turnaround") Starfleet experimented with the technology, outfitting the starship Paradox with shunt drive. Although the experiments were a success, individuals from the Mirror universe stole the ship, leading to its destruction and the abandonment of that technology. (NF comic: "Turnaround")