AC bus one, AC bus two.
5 seconds sound clip from the Apollo 13 movie soundboard.
You can hear this line at 00:53:14 in the Blu-ray version of the movie.
Quote context
[...]
- Houston, I'm switching over Quad C to main A.
- Okay, Houston, fuel cell one, fuel cell three.
- We got a main bus B undervolt, cryo pressure, suit compressor. What don't we have?
- I don't know, maybe this is a caution and warning failure.
- Houston, we are venting something out into space.
- I can see it outside window one right now.
[...]