Between 1405 and 1433, Jung Ha led seven voyages throughout the Indian Ocean, the expeditions of these so-called treasure ships. And they were huge. Columbus's first voyage consisted of three ships. Jung Ha led an armada of over 300 with a crew of over 27,000, more than half of London's population at the time. And some of these ships were, well, enormous. The flagships, known as the treasure ships, were over 400 feet long and had seven or more masts. You see that tiny little ship there in front of the treasure ship?