The Field Secured Container Vessel (FSCV) was a class of fueltankerspacetug that was used to transport starship fuel cells by the Galactic Empire. Two FSCVs could generate one or more force field bubbles or spheres using force-field generators. Additional force fields could be linked, forming a train. An FSCV contained a command capsule, a force field generator, fuel cells, an auxiliary command capsule, hexagonal-shaped engines. One train of FSCVs was Black Ice, which consisted of nine fuel bubbles and was assigned to the Imperial Replenishment Fleet DK-209 before it was captured by the Alliance to Restore the Republic and destroyed in a collision.