If you will now kindly take your seats these two gentlemen will descend into the pit and make the final adjustments. I will then press the electric button upon this table and the experiment will be complete.'

An audience after one of Challenger's harangues usually felt as if, like the earth, its protective epidermis had been pierced and its nerves laid bare. This assembly was no exception, and there was a dull murmur of criticism and resentment as they returned to their places. Challenger sat alone on the top of the mound, a small table beside him, his black mane and beard vibrating with excitement, a most portentous figure. Neither Malone nor I could admire the scene, however, for we hurried off upon our extraordinary errand. Twenty minutes later we were at the bottom of the shaft, and had pulled the tarpaulin from the exposed surface.

It was an amazing sight which lay before us. By some strange cosmic telepathy the old planet seemed to know that an unheard-of liberty was about to be attempted. The exposed surface was like a boiling pot. Great grey bubbles rose and burst with a crackling report. The air-spaces and vacuoles below the skin separated and coalesced in an agitated activity. The transverse ripples were stronger and faster in their rhythm than before. A dark purple fluid appeared to pulse in the tortuous anastomoses of channels which lay under the surface. The throb of life was in it all. A heavy smell made the air hardly fit for human lungs.

My gaze was fixed upon this strange spectacle when Malone at my elbow gave a sudden gasp of alarm. 'My God, Jones!' he cried. 'Look there!'

I gave one glance, and the next instant I released the electric connection and I sprang into the lift. 'Come on!' I cried. 'It may be a race for life!'

What we had seen was indeed alarming. The whole lower shaft, it would seem, had shared in the increased activity which we had observed below, and the walls were throbbing and pulsing in sympathy. This movement had reacted upon the holes in which the beams rested, and it was clear that a very little further retraction – a matter of inches – the beams would fall. If they did so then the sharp end of my rod would, of course, penetrate the earth quite independently of the electric release. Before that happened it was vital that Malone and I should be out of the shaft. To be eight miles down in the earth with the chance any instant of some extraordinary convulsion taking place was a terrible prospect. We fled wildly for the surface.

Shall either of us ever forget that nightmare journey? The lifts whizzed and buzzed and yet the minutes seemed to be hours. As we reached each stage we sprang out, jumped into the next lift, touched the release and flew onwards. Through the steel latticed roof we could see far away the little circle of light which marked the mouth of the shaft. Now it grew wider and wider, until it came full circle and our glad eyes rested upon the brickwork of the opening. Up we shot, and up – and then at last in a glad moment of joy and thankfulness we sprang out of our prison and had our feet upon the green sward once more. But it was touch and go. We had not gone thirty paces from the shaft when far down in the depths my iron dart shot into the nerve ganglion of old Mother Earth and the great moment had arrived.

What was it happened? Neither Malone nor I was in a position to say, for both of us were swept off our feet as by a cyclone and swirled along the grass, revolving round and round like two curling stones upon an ice rink.