The Korolev Hydrogen Drive is an improved form of spacecraft thruster with an extremely efficient fuel to thrust ratio. Utilizing high-density pellets of the hydrogen isotope Tritium, Korolev drives allow humanity to accelerate virtually any amount of mass to relativistic speeds. As an example, it took fewer than a hundred thousand tons of Tritium for Lifeboat [[Leif Eriksson]] to travel 17 years at 1G acceleration. Most intra-system craft carry only a few thousand pounds of the radioactive pellets. Korolev Drives produce an intense plume of super-heated plasma which can extend for kilometers behind a craft, and as such are extremely dangerous to use in close quarters maneuvering. Additionally, sophisticated sensing systems have enabled fingerprinting drive plumes at interplanetary distances and identifying the associated ship with a relatively high degree of accuracy.