Someone has broken into the coffin. It's empty.
3 seconds sound clip from the Isle of the Dead (1945) movie soundboard.
You can hear this line at 00:07:10.770 in the Blu-ray version of the movie.
Quote context
[...]
- The horseman on the pale horse is pestilence. He follows the wars.
- I'll leave this here to guide us back.
- There's another watchdog for you, General.
- He only guards the dead. I have to worry about the living.
- Someone has broken into the coffin. It's empty.
- Maybe you've got the wrong crypt. After all, it's a long time since you were last here.
- No, I'm sure this was the place.
- Why should anyone be here and singing?
- It's a nice moonlit night. Someone might have crossed over.
[...]