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struck metal. We withdrew it and substituted a bit designed to drill into metal. Eventually we breached the metal and, withdrawing the drill, we again saw the soft blue light shining as before. Suddenly we heard a low humming noise and were startled to see the section of the wall we were working on abruptly lift out of sight. It would be an understatement to say we were frightened.

     “‘What lay before us was incomprehensible: a blue-lighted corridor which appeared to be made of some sort of translucent, seamless, self-illuminating; blue-colored metal or plastic. At first we were very apprehensive about investigating the enigmatic hallway. Our curiosity soon overcame our fear, however, and we entered the corridor. We had to stoop, for the hallway was only five feet in height. After walking about 50 yards we came to another corridor leading off to our left and decided to explore it. We reached the end of the corridor after walking about 100 yards.

    “‘There we encountered a steep, spiraling stairway. We descended it for at least twenty minutes, all the while noting that the lighting was becoming more brilliant. Finally we reached the bottom and were confronted with yet another corridor, this one light green in color.

     “‘After a brief rest we set off down that corridor. It was only about 100 feet long, and we traversed it quickly. To the right and left were oval entrances. Making a quick decision, we decided to enter the one on the right, and noticed immediately that it was cylindrical-shaped and much larger then the previous passageways. It contained a floor on the same level as the previous ones. We also noted that this passage was evidently made of some crystalline substance, and that a bright, but soft white light emanated from it. It curved downward at a slight angle.

    “‘We next came to a huge chamber which appeared to be some type of scientific laboratory and hydroponic