Jiugong Tunnel is a fascinating underground network on Little Kinmen Island. Built-in 1965 to protect ships from bombing raids, these tunnels stretch 790 meters long and feature multiple exits to the sea. Although they may not be as impressive as the Zhaishan Tunnels on Kinmen Island, Jiugong Tunnels offer a unique glimpse into the island's military history and strategic defenses. Visitors can explore the tunnels, learn about their construction, and enjoy other activities on the island like fishing, clamming, and paddle boarding.