《地下奇观》第二季探索神秘地下世界，揭示古老文明与现代科技交织的惊人秘密。之后1

　　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)