The UnXplained season 3 episode 5
Episode title: Secrets of the Immortals
Sacred waters with remarkable healing powers. Ancient mystics who lived for hundreds of years. A scientific breakthrough may provide the answers to eternal life. Throughout history many have searched for the secret to everlasting life, but so far, it's eluded them. But is it possible to cheat death and live forever? What if, by re-examining ancient teachings and harnessing modern technology, we could eventually become immortal?
