That transmission... Mother's deciphered part of it. It doesn't look like an S.O.S.
7 seconds sound clip from the Alien (1979) movie soundboard.
You can hear this line at 00:30:31 in the Blu-ray version of the movie.
Quote context
[...]
- Wonder what happened to the rest of the crew.
- Let's get the hell out of here.
- Hey, Dallas, Lambert, come on over here.
- Come on.
- That transmission... Mother's deciphered part of it. It doesn't look like an S.O.S.
- Well, I... It looks like a warning.
- I'm gonna go out after them.
- I mean, by the time it takes to get there, you'll... they'll know if it's a warning or not, yes?
[...]