- What does the water do?
- Must be part of the power system. The ocean tides are turned into energy somehow.

— Logan 5 (Michael York)

9 seconds sound clip from the Logan's Run movie soundboard.

You can hear this line at 01:44:09 in the Blu-ray version of the movie.

Quote context

[...]

- Here we go. That's right.

- You mean to say those people know ahead of time when they're gonna die?

- That's right.

- That's silly. What's the reason for that?

- That's the way things are. The way they've always been.

- It takes all the fun out of dying.

- But if they're all shut up tight in there as you say, how we going to get to see them? All the young people? What'd you say?

- What does the water do?

- Must be part of the power system. The ocean tides are turned into energy somehow.

- Does it go inside the city?

- Yes, I think so. I don't know where, though.

- Just took it for granted, like everything else.

- I think it's our only chance.

(waterfall)

[...]