Yeah, my bad, I was thinking about the horde that appears when you're turning the water on before showering.Tanks? I think you're talking about a different defense section than I'm thinking about. I'm in story mode, in B1 restarting the generators. There are planks I can use to barricade the office windows and doors, and places to install laser turrets. There's nothing to climb on as far as I can see.
EDIT: And forgot they added tower defense for some reason...
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