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The fourth instalment opens with rare footage of Kavachi, an undersea volcano, erupting. The South Pacific islands are typically volcanic in origin, and those of Hawaii are among the youngest. Kilauea’s rivers of lava flow directly into the sea, where they cool rapidly and release steam explosively. Pioneering species such as ōhia lehua colonise new land, putting roots down through the cracks into subterranean lava tubes where strange troglobites eke out their existence.
Length 58 minutes