Can zombies spawn in underground tunnels I build?

I saw on another post someone saying that zombies couldn’t spawn underground (but then saw someone else say that they could).

I typically mine at night just below my base. I don’t believe I’ve ever seen a zombie spawn in my tunnels, but just wanted to double check if that’s something that happens now (last I played was Alpha 16 or so).

submitted by /u/Monkfrootx
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