- That wall is as strong today as it was centuries ago. The natives keep that wall in repair. They need it.
- Why?
- There's something on the other side of it, something they fear.

Carl Denham (Robert Armstrong)

11 seconds sound clip from the King Kong (1933) movie soundboard.

You can hear this line at 00:21:15.804 in the Blu-ray version of the movie.

Quote context

[...]

- There's a long, sandy peninsula.

- The only possible landing place is through this reef.

- The rest of the shoreline is sheer precipice, hundreds of feet high.

- And across the base of that peninsula, cutting it off from the rest of the island, is a wall.

- A wall?

- Built so long ago that the people who live there have slipped back, forgotten the higher civilization that built it.

- That wall is as strong today as it was centuries ago. The natives keep that wall in repair. They need it.

- Why?

- There's something on the other side of it, something they fear.

- A hostile tribe.

- Did you ever hear of Kong?

- Why, yes. Some native superstition, isn't it? A god or a spirit or something.

- Well, anyway, neither beast nor man. Something monstrous, all-powerful.

[...]