Piyamit Tunnel wind through a mountain for approximately 1 kilometer and is nearly 20 meters wide at certain points, with multiple entrances. It was built in 1976, taking three months to complete. Though the area is presently part of a village belonging to the Thai National Development Front, it was once a stronghold of the Communist Party of Malaya. It was once used as an air raid shelter and food storage area.
At present there is an exhibition about the history of Piyamitr Tunnel, including the way of life in the forest. It is open to the public from 8.00 am-4.30 pm daily. The tunnel is located at Ban Piyamit 1, Tambon Tano Mae Ro.
To get there, take the same route as the Betong Hot Spring route, going past the hot spring for an additional 4 kilometers.
Location: Ban Piyamit 1, Tambon Tano Mae Ro, Betong District, Yala 95110 Thailand