Can iron farms be underground?

Can iron farms be underground? Minecraft players should begin by digging down 12 blocks. They can then hollow out the area they want to put the farm in. This should be three blocks wide, eight blocks long, and seven blocks tall.

Minecraft players should begin by digging down 12 blocks. They can then hollow out the area they want to put the farm in. This should be three blocks wide, eight blocks long, and seven blocks tall.