Supply depot

"In order to equip additional personnel you must have enough supply depots to support them."

- Terran adjutant

The supply depot houses all the goods, tools and accessories that are necessary for the running of a terran base. It is used by both military units and colonists. Such storage includes weapons, ammunition and even SCVs.

Under the Terran Confederacy, supply depots were standard for military bases and possessed a universal design.

StarCraft I
The supply depot is by far one of the most important buildings in the terran tech tree. Similarly to the pylon (protoss) or the overlord (zerg), it provides "supply points" which allow for the construction of new units. Unlike overlords and pylons, however, it does not have any additional abilities.

StarCraft II
In addition to providing supply in StarCraft II, the depot gains the ability to lower and rise from the ground. When lowered ground units may pass over it.

Upgrades
In StarCraft II: Wings of Liberty, an upgrade exists that allows supply depots to be built automatically. This costs 10 protoss research points.

Development
Small units could originally pass between supply depots. This was removed by September 2007.