The problem now is not so much a question of adequate oxygen supply, but it is the rate of consumption of water which is vitally needed for the cooling operations to maintain the electronic systems.
15 seconds sound clip from the Apollo 13 movie soundboard.
You can hear this line at 01:11:42 in the Blu-ray version of the movie.
Quote context
[...]
- We expect loss of signal in approximately ten seconds.
- So long, Earth. Catch you on the flip side.
- And then you pass into the lunar sunrise over the lunar surface.
- It must be an awe-inspiring sight. I can't wait to see it myself.
- Look at the Tsiolkovsky Crater.
- I can't believe how bright the ejecta blanket is.
- It's like snow. It's beautiful.
[...]