With the historic Chang'e-6 mission, China returned the world's first samples from the far side of the moon. The Chinese engineering team that spent more than a decade perfecting the probe say the samples it collected are "a gift to the world." Learn how this feat was achieved in this clip taken from "Back to the Far Side."

Stay tuned for "Back to the Far Side," a 4K documentary presented by CGTN and the China National Space Administration.