Vinh Moc Tunnels is a unique military architectural work, constructed entirely by human effort using rudimentary tools such as picks and shovels from 1965 to 1967. The system consists of 3 interconnected levels:
- Level 1 (8-12m deep): Main living area.
- Level 2 (12-15m deep): Headquarters, storage, and meeting area.
- Level 3 (20-23m deep): Bomb shelter, weapons, and food storage.
The total length of the main axis is about 768-870m, and the entire system spans over 2,000m with 13 entrance/exit gates (7 facing the sea, 6 facing the hills). The tunnel passages are 1.6-1.9m high and 0.9-1.2m wide, excavated on a slope for drainage, taking advantage of the natural basalt soil that becomes increasingly firm. It is truly a perfect underground fortress, difficult to be destroyed by bombs and bullets.





