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Humanity has launched satellites into outer space and submarines to the ocean floor, but the ground below Earth's surface remains shrouded in mystery. Are there profound secrets buried beneath layers of rock, or hidden in vast caves? Can the subterranean world below shed light on humanity's past, or even its future?
初放送日 : Jul 19, 2019
最終放送日 : Dec 22, 2023
エピソード : 83 エピソード
シーズン : 6 シーズン
ランタイム: 43 分
スタジオ: History
キャスト: William Shatner, Tok Thompson
クルー: