Of course, it's normally the duty of a captured soldier to attempt escape.

5 seconds sound clip from the The Bridge on the River Kwai movie soundboard.

You can hear this line at 00:19:13.495 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, I'd say the odds against a successful escape are about 100-to-1.

- Right. But may I add another word, colonel?

- Please.

- The odds against survival in this camp are even worse.

- You've seen the graveyard. They're your real odds. To give up hope of escape to even stop thinking about it, is like accepting a death sentence.

- Why haven't you tried to escape, commander?

- Oh, I've been biding my time. Waiting for the right moment, the right company.

- I understand how you feel.

- Of course, it's normally the duty of a captured soldier to attempt escape.

- But my men and I are involved in a curious legal point of which you are unaware.

- In Singapore, we were ordered to surrender by command headquarters. Ordered, mind you.

- Therefore, in our case, escape might well be an infraction of military law. Interesting?

- Yes. Interesting point, sir.

- I'm sorry, sir, I didn't quite follow you. You mean you intend to uphold the letter of the law, no matter what it costs?

[...]