Editing Mont Tanoa (section)

=== Underground installations ===
The interior of Mont Tanoa contained a network of tunnels, shafts, reinforced rooms, ore corridors, storage chambers, and restricted-access areas. Some spaces were adapted from natural volcanic cavities, while others were excavated for mining and military use. The tunnel system extended into the volcanic core and connected work areas with surface structures through guarded shafts and lifts.

Underground sectors were used for gold and emerald extraction, ore transport, equipment storage, prisoner labor assignments, and protected command functions. Movement inside the system was regulated through checkpoints and assigned routes. Ventilation systems were built to support deeper work areas, although conditions for prisoners remained hazardous due to heat, dust, confined passages, and limited air circulation.