Out of the Unknown S02 E01 The Machine Stops

In the far future, the material needs of humankind are tended by the omnipresent Machine, which makes their environment, in vast tunnels beneath the earth, comfortable and safe. But safe from what? And what if the Machine Stops? A young boy, Kuno, finds his questions can't be answered until he has lifted the veil of security and trespassed upon the surface.