Grylls parachutes into a Costa Rican rainforest in the Osa Peninsula, with only his knife and a canteen. He's careful about the water he drinks, but gets violently ill anyway. He climbs down a waterfall using a vine, and floats down a river to the ocean on a raft he crafts out of balsawood to demonstrate how someone lost in the jungle can make it to civilization. He encounters snakes, mosquitoes and dangerous river currents.ve swamps.

Bear Grylls
Self

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