- Where are we going?
- We are going deep into the bowels of the planet, where even now, our race is being revived from its five-million-year-old slumber.

9 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 3 sitcom.

You can hear this line at 00:25:14.880 in the Blu-ray version of the TV Series.

Quote context

[...]

- You must come with me. Great things are afoot.

- Come, come now, or you'll be late.

- Late? What for?

- What is your name, human?

- Dent, Arthur Dent. Late, as in the late Dent, Arthur Dent.

- It's a sort of threat, you see. I've never been terribly good at them myself, but I'm told they can be terribly effective.

- What an extraordinary person.

- I beg your pardon?

- Nothing.

- Where are we going?

- We are going deep into the bowels of the planet, where even now, our race is being revived from its five-million-year-old slumber.

- Magrathea awakes.

- Excuse me, what is your name, by the way?

- My name? My name is Slartibartfast.

- I beg your pardon?

- Slartibartfast!

- Slartibartfast?

- I said it wasn't important.

[...]