CentralNotice From Wikipedia, the free encyclopedia Jump to: navigation , search Sea Dragon internal and external views. Both show the ballast tank attached to the first stage engine bell. An Apollo CSM -like spacecraft is mounted on top. Saturn V . Its second stage would fit inside the first stage engine and nozzle of the Sea Dragon. The Sea Dragon was a 1962 design study for a two-stage sea-launched orbital rocket . The project was led by Robert Truax while working at Aerojet , one of a number of designs he created that were to be launched by floating the rocket in the ocean. Although there was some interest at both NASA and Todd Shipyards , nothing ever came of the design as NASA's Future Projects Branch was shut down in the mid‑1960s. At 150 m long and 23 m in diameter, Sea Dragon would have been the largest rocket ever built. 1 Design 2 See also...