We moved on after we left the cave for a considerable period of time in silence. I was busy making mental notes of every salient feature that might be useful to me in retracing my steps, but I found nothing other than a winding and gently ascending corridor, without crossings or branches, until we reached the foot of a long flight of stone steps at the summit of which we emerged into a large chamber in the walls of which there must have been at least a dozen doorways, where, to my great disappointment, I was immediately blindfolded. They whirled me around then, but evidently it was done perfunctorily, since it was exactly one full turn and I was halted in my tracks facing precisely in the same direction that I had been before. This I was positive of, for our powers of orientation are often tested in this way in the air service. Then they marched me straight forward across the room through a doorway directly opposite that at which I had entered the chamber. I could tell when we left the larger chamber and entered the corridor from the different sound which our footsteps made. We advanced along this corridor ninety-seven paces, when we turned abruptly to the right and at the end of thirty-three paces emerged into another chamber, as I could easily tell again from the sound of our footsteps the instant we crossed the threshold. They led me about this chamber a couple of times with the evident intention of bewildering me, but in this they did not succeed, for when they turned again into a corridor I knew that it was the same corridor from which I had just emerged and that I was retracing my steps. This time they took me back thirty-three paces and then turned abruptly to the right. I could not but smile to myself when I realized that we were now continuing directly along the same corridor as that which we had entered immediately after they had first blindfolded me, their little excursion through the short corridor into the second chamber having been but a ruse to bewilder me. A moment later, at the foot of a flight of steps they removed the blind, evidently satisfied that there was now no chance of my being able to retrace my steps and find the main tunnel leading to the crater, while, as a matter of fact, I could easily have retraced every foot of it blindfolded.