In ancient times, Japan was once covered with trees. Traces of this primordial forest still remain in the deep, untouched woods of Yakushima Island, Japan's first World Heritage Site. A prime example is the Jomon Sugi, a large Japanese cedar that is more than 2,000 years old. However, according to legend, an undiscovered "giant cedar tree" exists on the island. Using cutting-edge technology, NHK began the search for this legendary tree. See what they discover on their quest to find and understand these spectacular cedars.

• Sam Bankman-Fried