The light was out. They didn't know.
5 seconds sound clip from the Three Skeleton Key (Escape) classic radio play.
You can hear this line at 00:25:14 in the radio play.
Quote context
[...]
- Below, it had grown quiet. They'd cleaned us out and now they too were waiting. All waiting.
- And then the rats... quite suddenly... were silent.
- And then I saw the sky and the stars. The rats were gone.
- The light was out. They didn't know.
- I wanted to open the windows to call out to them, to warn them somehow, but... I was afraid.
- What if the rats were hiding from me? Tricking me? So I waited.
- She grounded very softly on a reef not two hundred yards from the key.
- They tried washing her back off.
[...]