Why basements?


Saw the movie over the course of three nights but I forget; why was it that earlier in the investigation they were looking into houses that had basements? I don't remember at all why it was important. Hopefully someone can elaborate on that

Thanks!!

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Basements are not common in California. Where I'm from, it's weird if you don't have one.

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A basement for future use...

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Believe one of the earlier Zodiac letters mentioned a house with a basement. (First link in an above response, not sure what that second one has to do with this thread.)

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