Once in Ulm, we lie low until night. Then we take a train to Friedrichshafen.

3 seconds sound clip from the Stalag 17 movie soundboard.

You can hear this line at 00:04:58.198 in the Blu-ray version of the movie.

Quote context

[...]

- All right, now let's hear it once more, boys.

- We've been over it 100 times.

- Let's hear it again.

- We stick to the forest going west until we hit the Danube.

- Check.

- Then we follow the Danube up to Linz.

- Check.

- In Linz, we hop a barge and go all the way to Ulm.

- Check.

- Stop it, Joey! Joey, go back to sleep!

- Go on. You're in Ulm.

- Once in Ulm, we lie low until night. Then we take a train to Friedrichshafen.

- Once in Friedrichshafen, we steal a rowboat, get some fishing tackle, and start drifting across the lake... always south, till we hit the other side, Switzerland.

- Once in Switzerland, just give out with a big yodel so we'll know you're there.

- It's a breeze.

- Stay out of this, Sefton.

[...]