In addition to what can be seen above ground, there is also a completely intact spider web of small and large underground tunnels going in all directions, says Lin Hui-cheng, head of Taipei National University of the Arts 'Research Institute for Traditional Architecture.
除了地面可見，「地面下四通八達蛛網般的大小坑道，更是舉世少見完整的戰爭遺跡，」國立台北藝術大學建築古蹟研究所所長林會承指出。