The Secret Tunnel Network is a secret network of tunnels connecting several locations, including the [[Omnifunctional Production Facility]]. As it is [[secret]], only OPF-side terminals are pictured in this manual.

The OPF entrance:

<= Secret Tunnel Network/OPF

The Long Distance Access tunnel, constructed by GTech™ [[Tunnel Boring Machine]] technology.

<= Secret Tunnel Network/LDAT