The coolant appears highly contaminated.

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

You can hear this line at 01:42:24.210 in the Blu-ray version of the movie.

Quote context

[...]

- Everybody out! Clear the compartment! Out! Out!

- Ventilation system, shut it down now.

- They don't respond. The controls don't respond!

- Then bypass it. Seal it manually! Move! Shut it off! Come on!

- Melekhin, say again.

- 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!

[...]