In twilight chronicles a few years ago now, i had a whole series of encounters planned to entice the PCs underground. I dont think we quite got there though.
But yes, in general, i think tunnels would be great for the reasons you mention. And even if there isnt anything you can see, its often the thought of "whats in the dark" that builds the tension.
There was that show on pay tv, and more recently on commercial tv in australia (where i seen it). It was called "Earth after humans" or something.
In it, they said the NYC subway system has 4 million gallons (!) of water pumped out of it each day.
I guess most subway systems, being underground, are "below the water line".
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