This may be them! Maybe they are coming through from the space platform.
4 seconds sound clip from the Robot Monster (1953) movie soundboard.
You can hear this line at 00:19:56.512 in the Blu-ray version of the movie.
Quote context
[...]
- Do you think we still have a garrison on the space platform? Ro-Man hasn't destroyed that yet.
- Well... It could be. If we only could get through to them.
- But why should we succeed where others failed?
- Don't you talk like that, dear.
(intense tone whistling and buzzing)
- This may be them! Maybe they are coming through from the space platform.
- Now I know you are watching. I see five of you who have not been destroyed.
- Show yourselves, and I promise you a painless death.
- Just the five of us left? But this is incredible!
[...]