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I meant: two levels below each other, down and deeper down...
Oh. In that case, it's probably because of foundation. A basement can't just be dug up out of the ground, it needs to be built in a certain area where you could do that safely and efficiently. If it were possible, I'm certain the bomb shelter boom during the cold war would've birthed some second basement levels.
Not sure if this counts, but my best friends technically have one of these as well, they have a semi-homemade indoor pool in the basement and it's just deep enough to contain a hidden door on the side of its interior, which makes it "below" the regular basement. I'm told it's an emergency tunnel.