But the fourth time, as the water lowered nearly to the bottom of the ditch, we waited in vain for the rushing water and then...

9 seconds sound clip from the Leiningen Versus the Ants (1948) classic radio play.

You can hear this line at 00:18:17 in the radio play.

Quote context

[...]

- Aha! Here it comes! Here comes the water!

- Yes, we'll give the crawlers a ditch to ride in... right out the river! There! Look at 'em go!

- Leiningen's tactics were successful... at first.

- The violent flow of water at the original depth raced through the ditch, overwhelming leaves and ants, and sweeping them along.

- Three times, the ditch was emptied. Three times, the ants raced across its bottom. And three times, the rushing water, arriving just in time, carried them away.

- But the fourth time, as the water lowered nearly to the bottom of the ditch, we waited in vain for the rushing water and then...

- Senor!

- What's the matter? What's gone wrong at the dam?

- The ants! Just as the man at the dam lowered the water almost to the bottom, the ants attacked. Before he could open the floodgates, he was almost surrounded.

- He ran. The ants kept coming. They are across the ditch!

- Leiningen stood motionless, absorbing the news of his defeat without a word.

[...]