The Chenggong Coastal Defense Tunnel (Chinese: 成功海防坑道; pinyin: Chénggōng Hǎifáng Kēngdào) is a tunnel in Jinhu, Kinmen County, Taiwan.

The tunnel was dug through granite layers of rock and concrete.

[1][2] The tunnel is equipped with various military equipment, including command post, pillbox, barracks, toilets and kitchen.

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