When we first found it, we thought it might be magnetic rock, but all the geological evidence was against it.

8 seconds sound clip from the 2001: A Space Odyssey (1968) movie soundboard.

You can hear this line at 00:48:06 in the Blu-ray version of the movie.

Quote context

[...]

- By the way, I wanted to say to both of you, I think you have done a wonderful job.

- I appreciate the way you've handled this thing.

- The way we look at it, it's our job to do this thing the way you want it done. We're only too happy to be able to oblige.

- Have you seen these yet?

- Have a look. Here's what started the all thing.

- Oh, yeah.

- When we first found it, we thought it might be magnetic rock, but all the geological evidence was against it.

- And not even a nickel-iron meteorite could produce a field as intense as this.

- So we decided to have a look.

- We thought it might be the upper part of some buried structure. So we excavated out on all sides, but unfortunately, we didn't find anything else.

- And what's more, the evidence seems pretty conclusive that it hasn't been covered by a natural erosion or other forces.

[...]