- Get us to periscope depth. We'll ventilate with the outside air.
- Aye, Captain. Periscope depth! Prepare to ventilate!

6 seconds sound clip from the The Hunt for Red October movie soundboard.

You can hear this line at 01:42:35.221 in the Blu-ray version of the movie.

Quote context

[...]

- Suffered a leak in the primary coolant tube, so I shut down the reactor, but the ventilation circuits have been disabled.

- The coolant appears highly contaminated.

- I knew there was damage when the caterpillar went down.

- Captain, radiation alarms activating in all compartments.

- Engineering is heavily contaminated, and radiation is moving forward.

- Get us to periscope depth. We'll ventilate with the outside air.

- Aye, Captain. Periscope depth! Prepare to ventilate!

- Ventilating won't do anything.

- We've got to get the men.

- What is the battery condition?

- Four hours. Six, if we're cautious.

- Engage battery system.

- Captain, we've got a level one radiation leak. Every surface of this ship is contaminated. Simply changing the air won't do. We've got to get the men off.

[...]