As the world's largest and oldest trees, the redwood stirs up big passions. Following two fanatical redwood fans, this documentary introduces us to explorer Mike Fay, who is charting this forest giant's range, and Steve Sillett - a man who has dislocated limbs and risked death trying to climb the tallest of these magnificent trees. In an epic, year-long journey, and using high-tech aerial laser surveys, discover the little explored environment of the redwoods. Featuring breathtaking footage we take a look into the past, present and future of this spectacular forest dweller and discover what makes the redwood so special.