andong tunnel, beihai tunnel, dahan stronghold, fortification, matsu, military tunnels, taiwan, tunnel 88

Matsu Archipelago Has the Highest Concentration of Military Tunnels

Small as it may be, the Matsu Archipelago (馬祖) has the highest concentration of military tunnels in the world. Named after the goddess Matsu (媽祖), it is an archipelago composed of six inhabited islands and 30 uninhabited islets in the northwest of Taiwan. Though the Matsu Archipelago is small, with an area of only 29.6 ...

Billy Shyu

The Beihai Tunnel.