Isolation Gate of the Transfer Zone

After ore is extracted from the Mining Zone, it is briefly piled here, waiting to be shipped up to the surface.
The area swarms with Blackstone Legion soldiers: dispatchers command by the platforms, laborers haul ore, overseers patrol nonstop, and Squad troops tightly guard every transport route.

The transfer zone is also the Mining Zone's only path to the surface. Once the gate drops, the diggings are cut off completely from the outside world. The gate is built with fortress-like strength, as if the designers always knew that unpredictable dangers were lurking deeper down.