Three, you should synchronise demolition with passage of train.
4 seconds sound clip from the The Bridge on the River Kwai movie soundboard.
You can hear this line at 01:46:25.432 in the Blu-ray version of the movie.
Quote context
[...]
- If we stay here much longer, we'll be up to our necks.
- I've got it all decoded, sir.
- One, original bridge works reported abandoned. New construction downstream from first site.
- Three, you should synchronise demolition with passage of train.
- Four, good hunting. Have fun. That's all, sir.
- A train and a bridge, that would be something.
- That would really be a show. Can we get there in time, sir?
- Yai says we're two to three days' march from the Kwai.
[...]