- Have you ever constructed a bridge across a stream like the Kwai?
- Yes, sir, half a dozen of them in Madras, Bengal.

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

You can hear this line at 01:06:54.816 in the Blu-ray version of the movie.

Quote context

[...]

- Well, one of the men took sick very suddenly this morning, sir, and, well, it took 3 or maybe 4 of the others to help him to hospital, sir. And, uh. Oh, he was took terrible sick, sir.

- A corporal should always know exactly how many men he has under him at all times.

- Oh, yes, sir.

- Have you a nervous affliction? If not, stop making those faces at once.

- It may be funny and I'm sure it's done with the best motives but it's not military behaviour.

- No, sir.

- We must put a stop to these demonstrations.

- Yes, sir.

- Have you ever constructed a bridge across a stream like the Kwai?

- Yes, sir, half a dozen of them in Madras, Bengal.

- If this were your bridge how would you get it under way?

- Get it under way, sir? Well, first of all, I wouldn't build it here.

- Oh? Why not?

- As I was trying to tell you a while ago, sir, the Japanese couldn't have picked a worse location.

- There's no bottom. You see those piles? They're sinking. Our chaps could drive those logs till doomsday and they wouldn't hold.

[...]