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The planet has a breathable oxygen-nitrogen mix, however most Hzians do not venture outdoors unless absolutely needed or armed, as there are many violent and vicious animals, plant life, and bacteria outside.
The buildings are instead connected through a system of above ground tunnels. Much of the native animals were killed during the Second Appearence-Ichiri war, in which the invading Ichiri slaughtered many animals out of protection. Recently, however, the population is growing again.