Pavement

=Pavement= With the possibility of subterranean attacks by Nod forces on GDI bases (or those of Nod traitors), it soon became evident that a way to prevent these attacks was needed. Commanders on both sides resorted to civilian technology, laying down layers of concrete pavement inside their bases. The tunneling vehicles in the Nod arsenal were unable to surface or dig through concrete, and therefore unable to attack a base fully laid out with pavement.