This Cabin belongs to the children of Hephaestus, the god of blacksmiths, sculptors, metallurgy, fire and volcanoes.

Hephaestus' Cabin is constructed of brick, and has a smokestack sticking out of it, mimicking a tiny factory. The entrance is like a vault door, circular and made of thick metal. It opens with a lot of gears turning and smoke hissing. The walls are made of glossy metal along with also metal slatted doors. It is noted for being unclean and messy, and is often filled with junk and miscellaneous items. The interior of cabin consists of steel bunk beds are folded against the walls, controlled with digital control panel. It has a basement, with power-tools, an assortment of weapons, a workbench, and stacks of scrap metal. A tunnel underneath it leads to Bunker 9.