Caught in an Underwater Avalanche, Expedition Raw

Kenny Broad, an environmental anthropologist and National Geographic Expeditions Council grantee, says the first rule in cave diving is to always run a continuous guideline. Subscribe: Watch all clips of Expedition Raw here: Get More Expedition Raw on Youtube: About Expedition Raw: Surprises, challenges, and amazing behindthescenes moments captured by National Geographic explorers in the field. Get Mo