Naval yard
From Command and Conquer Wiki
The Naval yard is a structure built on pillars embedded in the seabed that combines the facilities of shipyards, dry docks and naval commands. Built exclusively by the Allies, these large platforms were capable of building, repairing and maintaining vast fleets of naval vessels, ranging from small gunboats through destroyers to even the mighty cruisers.
The design was very simplistic, allowing for quick setting up of a fully operational naval base unlike its counterpart, the submarine pen. After the war, while focus shifted to larger, stationary shipyards, such easily set up naval yards continued to be in use.
