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Aired (April 7, 2018): The fifth longest cave in the Philippines is Capisaan Cave in Kasibu town, Nueva Vizcaya. It was closed to visitors for over 20 years to preserve it. When it reopened, Kara David tried to find out the treasure it hides. Can she handle the narrow passage and crowded rivers beneath the cave? Find out in this video. #GMANetwork #GMAPublicAffairs 'I-Witness' is GMA Network's longest-running and most awarded documentary program. It is hosted by the country's top documentarists --- Howie Severino, Kara David, Sandra Aguinaldo, and Atom Araullo. 'I-Witness' airs every Saturday, 10:30 PM on GMA Network. #GMAPublicAffairs #GMANetwork GMA Network promotes healthy debate and conversation online. Any abusive language that does not facilitate productive discourse will be blocked from this post. GMA Network upholds ethical standards of fairness, objectivity, accuracy, transparency, balance, and independence. Unbiased, Unprotected, Genuine Service. #GMAPublicAffairs #KapusoStream #GMANetwork Subscribe to the GMA Public Affairs channel: / gmapublicaffairs Visit the GMA News and Public Affairs Portal: http://www.gmanews.tv Connect with us on: Facebook: / gmapublicaffairs Twitter: / gma_pa