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The Piyamit Tunnel just outside Betong was dug in 1977 by members of the Malaya Communist Party in Yala to serve as a bomb shelter and a place to store supplies. Communism was rife back in the 1970s when the Americans retreated from the Vietnam War, with comrades filling the ranks of the anti-government parties across Thailand. Search and destroy raids were frequent and the communists quickly learned how to play hide and seek.

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