Mr. Menzies supported his theory with secret pre-Columbian maps showing results of the Zheng He voyage, ancient Chinese artifacts found far from home and remains of huge shipwrecks in Australia and the Caribbean, He also reconstructed the chinese star navigation system on his home computer and traced the historic round-the-world voyage of Zheng He from March 1421 to October 1423. He concluded that the Chinese had explored the coasts of Africa, South America and Australia and sailed into the Caribbean.