Locked In: First Descent of the Beriman brings us to Papua New Guinea; a country seldom traveled, and into the Beriman Gorge, a river even less traveled. Led by Ben Stookesberry and Chris Korbulic, a team of four professional kayakers attempt to be the first to navigate this daunting river, which features a link-up of gorges so deep and narrow that you can’t see the bottom from a helicopter. What the kayakers encounter are class five rapids, 40-foot waterfalls, slippery bushwhacking, “lethal caves” and one of the most arduous expeditions of their lives. Through rope work, skill, team work and sheer determination, they venture through this remote and dangerous canyon.