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+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
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