At each stage of his imprisonment he had known, or seemed to know, whereabouts he was in the windowless building. Possibly there were slight differences in the air pressure. The cells where the guards had beaten him were below ground level. The room where he had been interrogated by O'Brien was high up near the roof. This place was many metres underground, as deep down as it was possible to go.

It was bigger than most of the cells he had been in. But he hardly noticed his surroundings. All he noticed was that there were two small tables straight in front of him, each covered with green baize. One was only a metre or two from him, the other was further away, near the door. He was strapped upright in a chair, so tightly that he could move nothing, not even his head. A sort of pad gripped his head from behind, forcing him to look straight in front of him.

For a moment he was alone, then the door opened and O'Brien came in.

'You asked me once,' said O'Brien, 'what was in Room 101. I told you that you knew the answer already. Everyone knows it. The thing that is in Room 101 is the worst thing in the world.'

The door opened again. A guard came in, carrying something made of wire, a box or basket of some kind. He set it down on the further table. Because of the position in which O'Brien was standing. Winston could not see what the thing was.

'The worst thing in the world,' said O'Brien, 'varies from individual to individual. It may be burial alive, or death by fire, or by drowning, or by impalement, or fifty other deaths. There are cases where it is some quite trivial thing, not even fatal.'

He had moved a little to one side, so that Winston had a better view of the thing on the table. It was an oblong wire cage with a handle on top for carrying it by. Fixed to the front of it was something that looked like a fencing mask, with the concave side outwards. Although it was three or four metres away from him, he could see that the cage was divided lengthways into two compartments, and that there was some kind of creature in each. They were rats.

'In your case,' said O'Brien, 'the worst thing in the world happens to be rats.'

A sort of premonitory tremor, a fear of he was not certain what, had passed through Winston as soon as he caught his first glimpse of the cage. But at this moment the meaning of the mask-like attachment in front of it suddenly sank into him. His bowels seemed to turn to water.

'You can't do that!' he cried out in a high cracked voice. 'You couldn't, you couldn't! It's impossible.'

'Do you remember,' said O'Brien, 'the moment of panic that used to occur in your dreams? There was a wall of blackness in front of you, and a roaring sound in your ears. There was something terrible on the other side of the wall. You knew that you knew what it was, but you dared not drag it into the open. It was the rats that were on the other side of the wall.'

'O'Brien!' said Winston, making an effort to control his voice. 'You know this is not necessary. What is it that you want me to do?'

O'Brien made no direct answer. When he spoke it was in the schoolmasterish manner that he sometimes affected. He looked thoughtfully into the distance, as though he were addressing an audience somewhere behind Winston's back.

'By itself,' he said, 'pain is not always enough. There are occasions when a human being will stand out against pain, even to the point of death. But for everyone there is something unendurable -- something that cannot be contemplated. Courage and cowardice are not involved. If you are falling from a height it is not cowardly to clutch at a rope. If you have come up from deep water it is not cowardly to fill your lungs with air. It is merely an instinct which cannot be destroyed. It is the same with the rats. For you, they are unendurable. They are a form of pressure that you cannot withstand, even if you wished to. You will do what is required of you.

'But what is it, what is it? How can I do it if I don't know what it is?'

O'Brien picked up the cage and brought it across to the nearer table. He set it down carefully on the baize cloth. Winston could hear the blood singing in his ears. He had the feeling of sitting in utter loneliness. He was in the mi............