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Clip: Season 2 Episode 2 | 2m 15s | Video has closed captioning.
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.
Aired: 07/13/22
Q&A
Steve Backshall takes PBS behind his adventures, explains how the expeditions are chosen, and explores our role in protecting these magnificent locations.
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