During the succeeding centuries there is no record of any effort on the part of the Spaniards to solve the mystery surrounding the well. This is not at all surprising, for from the first they took no kind of interest in questions affecting the Indian past of the country, and their innate avarice was not awakened by any well-founded suggestion that jewels and the precious metals had been cast as offerings into the Zenote. The mineral poverty of Yucatan was so obvious as not to permit of such a belief gaining currency, as is clear from the quotation given above from Bishop Landa. But there was another and a stronger reason why the pool should hold its secret fast. This was the extraordinary mechanical difficulty of dredging operations. As has been said, the height from the brink of the cenote to the water-level is seventy feet, and the basin is a complete and precipitous circle all round; there thus being no means of reaching the water except by some elaborate contrivance of a crane nature. M. D. Charnay in 1881 provided himself, in anticipation of his visit to Chichen with two automatic sounding machines, one of which was capable of bringing up half a cubic metre deposit. Owing, however, to the height of the cenote walls, the depth of the water, and the enormous detritus of centuries, he could do nothing. It has been reserved for our good friend Mr. Edward Thompson, whose earnestness is only matched by his persistence and his contempt for difficulties, to wrest from this ugly hole the full measure of its secrets. Some twelve months back he had set up an elaborate crane apparatus worked by hand-winches which, projecting considerably over the cenote, and moving in a large half-circle, supported a heavy iron dredger. By means of this machinery dredging over the whole surface of the well-bottom has been done to a considerable depth.