Tunnel network

Tunnel Networks were constructed by the GLA during their wars against China and the USA and their invasion of various nations in Europe and Asia. Tunnel Network entrances could be constructed anywhere that a GLA Worker could access, and allowed for the extremely rapid movement of units from one place to another, underground. Units were also repaired while inside the network. Network entrances were guarded by a small machine gun turret and a pair of RPG Troopers.

Variants
Dr. Thrax's Tunnel Networks were protected by a toxin-spraying weapon and dubbed "Toxin Networks". Later in the conflict, high-ranking GLA generals were able to order units to instantly tunnel up through the ground and create an entrance anywhere currently visible on their radar, without the need for a worker to consruct it. This way, they could launch shocking surprise attacks even from within the enemy's own base.