At the other end of the underground room there is a long passage ending in a door which gives entry to the other world outside the „green Wall“ It is a tumultuous elemental world, inhabited by birds and thickly clad in vegetation. Here too, to the great surprise of D-503 live men who have existed for centuries independent of the mechanical civilization on the other side of the „Green Wall“…

The inhabitants of this other world are always happy and good humored. They enjoy life. They eat the ancient „bread and drink“ wine and they wear no clothes but are covered with a thick coat of shiny hair rather like that of the horse and very beautiful to behold.

Y-330 conceives of a perfect human happiness in the synthesis of this elemental life with that of the mecanised civilisation behind the „Green Wall“. She tells D-503 of a conspiracy which she has organised with the idea of undermining the power of the „Benefactor“. The conspirators hope to gain possession of the interplanetary rocket while it is on a trial flight in the stratosphere in order to use it as a weapon with which to fight the mecanised state. D-503 cannot bring himself to denounce the conspirators for Y-330 would certainly be the first to be condemned to death…

The rocket flight takes place. Y-330 is on board in the capacity of radio-operator but at the very moment when the conspirators are about to seize the rocket their plot is discovered and the machine remains in the hands of the state. Y-330 naturally believes that D-503 has betrayed them and he realizes that she is probably lost to him for ever. And indeed he has, quite unwittingly been the cause of the plots failure for he has recorded the various exciting events of the last few days in his diary…

The next day the State Newspaper published the discovery of the plot and also the details of the „Major Operation“: one of the State scientists has discovered a method of destroying the imagination in mens minds by exposing certain brain centres to X rays. Once the imagination is destroyed men will never again attempt to liberate themselves from the great one hundred per cent mecanical happiness. And they will therefore be truly happy. It is announced that every single inhabitant of the mechanised state must undergo this operation and force will be applied to those who resist in order that they shall be happy even against their wish.

However it turns out that not everyone wishes to be happy by such a method and a revolt breaks out in the mecanised town. Detachments of men already operated on are sent to fight against the rebels. Having lost all imaginative sense and the sensibility that goes with it they destroy all that comes in their path like tanks pitilessly.