The skin of the LEM in some places is only as as thick as a couple of layers of tinfoil, and that's all that protects us from the vacuum of space.
13 seconds sound clip from the Apollo 13 movie soundboard.
You can hear this line at 00:48:06 in the Blu-ray version of the movie.
Quote context
[...]
- Now, when we get ready to land on the moon...
- Fred Haise and I will float through this access tunnel into the lunar module, leaving...
- EECOM, that stir's gonna be on both H2 and both O2 tanks, is that correct?
- The spacecraft will remain connected.
- We can get away with this because the LEM is designed only for flight in outer space.
- Fred Haise, Renaissance man.
- Okay. We'll head back up the tunnel now and back into the Odyssey.
- All right, we've returned to the command...
[...]