But since you are the only one who can spy on the safely, your mission is most important.
8 seconds sound clip from the The 72 Desperate Rebels (1978) movie soundboard.
You can hear this line at 00:05:34 in the DVD version of the movie.
Quote context
[...]
- We've no time left. We're gonna have to make a change to our plans.
- Yes, sir. I see... What is it changing, sir?
- But since you are the only one who can spy on the safely, your mission is most important.
- There's no room for failure.
- So tomorrow, no matter what happens, you mustn't reveal your true identity.
- That's enough. It's getting late now. You better get back.
[...]