Watch: Inside the World's Longest Sea Caves | Expedition Raw

Geologist and National Geographic grantee Nicolas Barth was studying active faults on New Zealand’s South Island when he decided to climb down some cliffs and go for a swim. That's when he discovered the longest sea cave in the world.
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Surprises, challenges, and amazing behind-the-scenes moments captured by National Geographic explorers in the field.

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PRODUCER/EDITOR: Nora Rappaport
SERIES PRODUCERS: Chris Mattle and Jennifer Shoemaker
GRAPHICS: Babak Shahbodaghloo and Chris Mattle
VIDEO: Jeff Creamer and Nicolas Barth
3D CAVE MODEL: Aaron Curtis
FEATURED IMAGE: Dave Bunnell

Watch: Inside the World's Longest Sea Caves | Expedition Raw
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