On the fateful day we were probably up to a height of about 40 feet and things were progressing smoothly. We were moving one of the guy wires to a higher position so we had just placed the rope substitute in place. Dr. Stearns and I began our climb. I don’t believe we had actually reached the top when the rope anchor slipped where it had been tied on the ground. All I remember is that I felt the tower begin to move and I immediately realized what had happened.