在以下頻道推出： Tubi
第 1 季，第 2 集: After securing special permission, a team of highly qualified experts explore the sprawling tunnel systems, finding their way into manmade caverns unseen for decades. The film also documents the horrors faced by forced laborers, compelled to construct the tunnel system under the most inhuman conditions.
War & Military · 2004年1月1日 · 52 分鐘