CSI: NY, Season 4

(on a dive boat, in the East River)

Danny:
(as he gears up to go into the water) A graveyard for subways? What happened, they run out of landfill or what?

Mac:
(laughs a little) Cheaper to sink 'em then scrap 'em.

Sheldon:
And the subway reefs provide a marine life sanctuary.

Danny:
Yeah, well screw the fish. Hope it provides us with a crime scene.

Mac:
Holden surfaced right here in the harbor. We're here. Subway reef is right under us. And we're gonna focus on the old Redbird transit cars. They're the ones that contain asbestos. It's dark down there. We got tidal currents, rocks and reefs to deal with.

Danny:
Let's look on the bright side. We're not gonna worry about sharks.