Looks like you uncovered an old air shaft.
4 seconds sound clip from the Ghostbusters II movie soundboard.
You can hear this line at 00:21:53 in the Blu-ray version of the movie.
Quote context
[...]
- Yo.
- You guys take it easy, all right?
- Come on.
- Looks like you uncovered an old air shaft.
- Man, that just goes on and on.
- This is very intense. We should get a deeper reading.
- Yeah. We're gonna need a deeper reading.
- Yeah, somebody has to go down there.
- Yeah, somebody's gotta go down there.
[...]