An idea was raised to me today. In the event of a Zombie Apocalypse, how useful would our sewer system be?

Personally, I think it could serve as a quick escape route when cornered. Granted, if the zombies follow you into the sewers, you are toast. But, if entered covertly, there should be few zombies present. Obviously you can't live down there, but it could have potential... thoughts?
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