Piyamit Tunnel was built in 1976 by the Malayan Communist Party (Zone 2) as a secret operational base along the Thai–Malaysian border. The tunnel was entirely hand-dug within approximately three months, reflecting strong planning, coordination, and collective effort.

The tunnel stretches about 1 kilometer and features a complex, winding layout with multiple branches designed to prevent enemy tracking. Inside, the space is clearly divided into functional zones, including living quarters, a clinic, storage rooms, communication tunnels, and a radio station. It also includes ventilation shafts and multiple emergency exits for safety.

One of the key engineering highlights is the “smokeless stove,” designed to cook without releasing visible smoke, reducing the risk of detection. This demonstrates the ingenuity and survival techniques developed during wartime.

The surrounding area is a lush tropical rainforest with cool weather year-round. It is home to rare plant species and the famous “Thousand-Year Tree” (giant Samphong tree) with large spreading roots, making it a major highlight of the site.

Today, the tunnel has been developed into a historical and natural tourism destination. Exhibits of weapons, tools, and photographs help tell the story of the former Malayan Communist members. Visitors can explore the real tunnel paths while learning about history, military strategy, and forest living up close.