What? You sure?
4 seconds sound clip from the Alien (1979) movie soundboard.
You can hear this line at 01:14:35 in the Blu-ray version of the movie.
Quote context
[...]
- It is right around there. Now, Dallas, you're gonna have to be careful.
- All right. I've reached... the third junction, and I'm going down.
- The hell's the matter with that box?
- Dallas, you're gonna have to hold your position for a minute.
- Look around. Are you sure it's not there? It's got to be around there somewhere.
- You may be getting interference.
- Dallas, are you sure there's no sign of it? I mean, it is there. It's gotta be around there.
[...]