When Helen Benson stumbled up to the shed that housed the space machine, the guards were not there.
8 seconds sound clip from the The Day the Earth Stood Still (1954) classic radio play.
You can hear this line at 00:47:39 in the radio play.
Quote context
[...]
- Never mind her! Check the guy.
- Klaatu barada nikto. Klaatu barada nikto. Klaatu...
- When Helen Benson stumbled up to the shed that housed the space machine, the guards were not there.
- Then she saw them. They were lying inside, their rifles fused and bent.
- Gort somehow knew that Klaatu was dead.
- Gort was already on the move. He was on the move toward Helen.
[...]