Last October, an elite team of whitewater kayakers led by Steve Fisher ventured to the Democratic Republic of the Congo, intent on rewriting the history books. Their goal: to become the first paddlers to successfully run the Congo River’s Inga Rapids, the largest rapids in the world. This 50-mile section of torrential whitewater has a history of punishing anyone who has attempted to conquer it. The new documentary CONGO: the Grand Inga Project follows these kayakers on and off the river as they attempt the first descent. Here’s a sneak peek at the production.

—Go to the CONGO: the Grand Inga Project site for information on the full 80-minute documentary, to be released this week.