[Rich]

He had already gone when Me, Nat and Ash began the acent in the elevator. About three minutes later we came to the top floor. We were greeted by the hum of machinery, but there was a slightly wierder sound coming from the roof. But still I didn't give it a thought and Nat soon found the main generator. "Here it is!" said Nat. I helped Ash into place in front of one of the three wheels. "Work 'em!" I said, The humming stopped, and the lights switched to emergency power. "What's that?" asked Ash as the sound I had heard started. "Errr Jim!" said Nat. "What is it?" I said wondering over to him. He pointed at the lift. It was moving, up, towards us...