chunk: Bobby tells Helen and Tom what he saw, but they do not believe him until Tom takes a diamond he found in Klaatu's room to a jeweler and learns it is "unlike any other on Earth". Klaatu finds Helen at her workplace, and they take an empty service elevator which abruptly stops precisely at noon. Klaatu reveals his identity and his mission, then asks for her help. He has neutralized all electricity everywhere, except for such things as hospitals and aircraft in flight.