Eternity Springs

Eternity Springs was a beautiful village built around a spring-hole in the ground and where "time spent was never wasted” according to the human colonists. But the colony held a secret. The spring, around which the village was built, offered the villagers eternal life but the price was a constant mutation, a mutation they hid with the use of holographtic discs. When the Doctor and Clara Oswald visited the Doctor used his sonic screwdriver to create a localised earthquake that saw the spring drain away. (COMIC: Eternity Springs)