Recently, I have turned up some rather puzzling indications that in those final days before their annihilation, the Krell had been applying their entire racial energies to a new project.
13 seconds sound clip from the Forbidden Planet (1956) movie soundboard.
You can hear this line at 00:57:51 in the Blu-ray version of the movie.
Quote context
[...]
- Afterwards, I lay unconscious for a day and a night.
- And yet you came back for a second go at it.
- It was a question of science, doctor.
- Otherwise, my researches here would've come to nothing... poor as they have been.
- A civilization without instrumentalities?
- Everything here is new. Not a sign of age or wear on any of it.
- Two thousand centuries. And during all this time, what was the power source?
[...]