A fleet of spacecraft have been secretly constructed using tachyon drives that are capable of interstellar travel at superluminal speeds. This astounding conclusion emerges from the disclosures of a whistleblower claiming to have served for 20 years on several secret space programs. Corey Goode says he served for six years on a spacecraft cable of interstellar travel that was named after a famous German theoretical physicist, who first proposed the existence of superluminal particles later named tachyons.
Tachyons are a putative class of particles which able to travel faster than the speed of light. Tachyons were first proposed by physicist Arnold Sommerfeld, and named by Gerald Feinberg. The word tachyon derives from the Greek tachus, meaning “speedy.” Tachyons have the strange properties that, when they lose energy, they gain speed. Consequently, when tachyons gain energy, they slow down. The slowest speed possible for tachyons is the speed of light.
Source: exopolitics.org/secret-interstellar-spacecraft-use-superluminal-tachyon-drives