《国家地理探险家：探索无底洞穴》

【国家地理探险家：探索无底洞穴】

A team of elite cavers led by 68-year old Bill Stone attempts a months-long expedition to officially make Cheve Cave in Oaxaca, Mexico the world’s deepest cave. A massive logistical undertaking above ground supports the lead team in the depths as they navigate an underground maze of twisting tunnels