The Lost Cosmonauts or Phantom Cosmonauts are an intriguing unsolved mystery from the last century that's still being examined to this day. They are subjects of a conspiracy theory alleging that some Soviet cosmonauts went to outer space and never returned alive. Their existence has also never been publicly acknowledged by either the Soviet or Russian space authorities. Did the lost cosmonauts exist? You'll have to decide for yourself as we discover the unexplained.

Discover the unexplained is a Youtube series created by Mystery Archives that focuses on a wide variety of mysteries ranging from urban legends, ghost towns, the paranormal, cryptids and more.