Nat Geo Amazing!: See a wrangler round up deadly sea snakes, risking his life to take their blood to create antivenin. Stripped of diving equipment and pushing his body to the limit, a free diver attempts to set a new record, descending hundreds of feet in one of the world's deepest underwater sinkholes. See how the basilisk lizard stays afloat and runs on water, earning the name Jesus lizard. And science is pitted against the supernatural as a scientist tests his theory of evolutionary fear on 200 subjects.

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