- Sounds like the beginning of the world.
- It is.

3 seconds sound clip from the Creature from the Black Lagoon (1954) movie soundboard.

You can hear this line at 00:13:26.106 in the Blu-ray version of the movie.

Quote context

[...]

(BOAT WHISTLE BLOWING)

(ALLIGATOR GROWLING)

- And I thought the Mississippi was something.

- It's a winding brook compared to the Amazon.

- This is exactly as it was 150 million years ago when it was part of the Devonian era.

- Sounds like the beginning of the world.

- It is.

- Even the animals here grow as they did in Devonian forests.

- The anteater is a giant with the strength of a bear.

- The centipede grows to be a foot long.

- The Amazonian rat is as big as a sheep.

- That's incredible.

- But it's true.

[...]