Cylo's whale fleet was a gigantic armada, a fleet composed of biological whale-ships. It was commanded by Doctor Cylo, and it also housed Cylo's research base. Cylo intended to hijack the Executor, which was being built above Kuat; however, his schemes were unsuccessful. Darth Vader employed the Force to persuade the whale-ships to plunge into a star located within the Kuat system, resulting in the complete annihilation of the entire whale-ship armada.