部分http资源不能在https下加载，请将网址切回http.
观看小提示:[DVD标清版] [BD超清版] [HD高清版] [TS抢先版:不清晰]
类型：纪录片 地区：俄罗斯 年份：2021
A team of Moscow cavers turned out to be the discoverers of the deepest secrets of the planet. They set a world record: the Verevkin cave in Abkhazia turned out to be the deepest on the planet.