Who first discovered Diaoyu Dao? Centuries before the islands became the focus of today's dispute, Chinese navigators recorded the routes they sailed, the islands they passed and the waters they knew. Part One begins with the Ming Dynasty sailing guide “Shun Feng Xiang Song” to examine the historical evidence behind China's claim to Diaoyu Dao, known in Japan as the Senkaku Islands. Watch “Diaoyu Dao: Small Islands, Big Stakes,” only on CGTN.