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Expedition
How a Lava Tube Forms
Steve explains how a lava tube forms as he and his team search by helicopter and car for an opening that will gain them access to explore the inside of one of these unique underground tunnels.
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51:08
Join a shark expedition to a remote volcanic island in Mexico’s Eastern Pacific.
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51:49
Travel to Gabon, where Steve explores the jungle in search of an undiscovered population o