China at that time was the undisputed leader in naval architecture, the "Treasure Ships" that Zeng He took on his documented voyages were nearly 300' in length, and carried ten masts. Chinese ships of the time also had refinements such as watertight compartments. Obviously, the technical expertise for such a voyage isn't really in doubt.
What I doubt is the motive, and most importantly, the evidence.
On his known trips, Zeng He's mission was to awe the provincial rulers along the route, collect tribute to the Emperor, and bring it home.
Voyages of exploration don't fit the Chinese character. Not even for this singular Admiral or his somewhat idiosyncratic Emperor.
Here's the website for the book and upcoming documentary. Tell me what you think. Be sure and check out the "evidence" page.
