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entrance.

     “‘While Rick Grayton (my American friend) stayed at the entrance as lookout, Don Lawrence (our Canadian friend) and I descended into the mine. It was in excellent shape and showed no signs of any deterioration whatsoever - hardly the type of mine

the government would condemn on its physical state alone.

    “‘We had just completed our preliminary investigation when we heard someone, apparently deep within the mine, shout in a high-pitched voice, "COME!"  We stopped dead in our tracks, and walked in the general direction from where the voice seemed to originate. Then we heard somebody or something running. We lighted a flare but saw nothing. We continued and again heard the running. By this time we were getting far back in the mine, and also very curious and excited. The running sounds ceased abruptly and we saw a faint blue light radiate from a far recess: Then we heard what we thought was the clank of a metal door closing.

     “‘We quickly found the area from which we saw the light radiating, but no door or opening could be found. However, upon tapping the walls with my pick-hammer, we

heard hollow metallic reports at several places.

     “‘After we had localized the hollow sounding area we marked it off by chiseling off pieces of rock and found that it was generally rectangular in shape, almost 5 feet in height and about two feet wide. Since we could investigate no further with the equipment at hand, we decided to come back the following night and continue our investigation.

     “‘Returning the following night, all three of us entered the mine. Very much to our surprise, the chisel marks were gone! It took us several minutes to find the hollow area again, but we finally did; and this time we had come prepared. Using a battery-powered rock drill, we penetrated about three inches into the rock when we