在地下奇观第二季中，探险者们揭开了神秘地下世界的秘密与惊险。两个男生是怎么弄的

　　Throughout this season of UNDERGROUND MARVELS, historians, engineers, and experts reveal underground structures that seem to defy human imagination, from Southwest England to Moldova and beyond. In South Dakota, a decommissioned military bunker lies abandoned 200-feet below the ground. Now, 50 years later, how has this massive silo been repurposed for a new generation? In Exete... (展开全部)