We were perhaps two thirds of the way up when the moon appeared. Its light didn't penetrate very far into the dense foliage, but it did enable us to make out the top of the mountain, which took the form of a vine covered outcrop of lava. We altered our course slightly, and at 9:50 P.M. the forest fell away and we faced a rough wall of rock some two hundred feet in height. Before tackling this last obstacle, we paused for a rest and some hot coffee from the thermos which was included in our equipment. Then, at five minutes past ten, we started the final ascent. The cliff proved to be more of a climb than we had anticipated, and the time was close to eleven before we pulled ourselves up over the last boulder and could look across the crater to the other rim. The last few feet we negotiated with the greatest caution. Martin, I think, was first, and he pulled himself on his belly across to the beginning of the inner slope. He lay quietly for a half minute, then muttered something under his breath which sounded vaguely like "I'll be damned", and made way for Baker, who was next. I squeezed in beside him, and so we got a look into the crater at the same time. Baker, being a very self-contained man, made no audible comment, but I must have, for the sight which met our eyes was certainly the last thing I had expected to see. The crater of Mount Kosan was filled with steel and concrete structures of gargantuan size, and of the most amazing shapes I had ever seen. I say amazing, but I do not mean in the sense of unfamiliar, on the contrary these incredible objects had the commonest shapes. Had it not been for trees and normal buildings to give the scene a scale, I would have sworn that we were looking into a picnic grounds a hundred feet across instead of a two mile diameter plain ringed by mountains 2,000 feet high. The buildings seen in the aerial photo occupied only a small part of the crater--all of the other structures must have been concealed by clouds. * * * * * Directly below our perch the rim dropped vertically into deep shadows, as the moonlight reached but half the crater. A thousand yards west of us, where the light first touched the floor, we could make out several clumps of brush or small trees, among which was set a rectangular concrete surface measuring perhaps four hundred feet square, and resting on hundred foot steel columns. Near this, and partly supported by the side of the mountain was what appeared to be a great table, of roughly the same area, but standing on trussed columns the height of a thirty story building. In front of this was a chair, if by chair you understand me to mean a boxlike building twenty stories high, with a braced back rising as far again. A half mile along the rim was an even larger structure whose dimensions could only be measured in fractions of miles, which resembled nothing more than a vast shed built against the cliff.