台湾地下空军基地，耗时十多年修建，隐藏在大山里的超级工程

Taiwan built an underground air force base in the Central Mountains over eight years at a cost of NT$40 billion, concealed for strategic defense. The base, part of a 1970s plan called Ansan and Tashan projects, was driven by security concerns following US-China relations and the desire to protect the island"s sovereignty.