Draining the China seas exposes the remains of the biggest battleship ever put on the water and the extraordinary truth behind a 700-year-old mystery. ➡ Subscribe: http://bit.ly/NatGeoSubscribe ➡ Get more Nat Geo Full Episodes: https://youtube.com/playlist?list=PLivjPDlt6ApSiD2mk9Ngp-5dZ9CDDn72 #kevin1230san