Aliens and Cover-Ups (S05E02)

In 1980, a trio of young servicemen ventured into a forest in the UK to probe into unusual lights. They allegedly stumbled upon an unidentified spacecraft. One of the soldiers, upon making contact with the craft, reported receiving a lengthy stream of binary code telepathically, which he documented and decoded. The military intervened, instructing them to remain silent about the experience. What drives the ongoing concealment of such UFO incidents, and what secrets could they unveil about humanity's ancient history?