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? That's a to-scale rendering of Christopher Columbus's flagship, the Santa Maria. Jung Ha wasn't an explorer. The Indian Ocean trade routes were already known to him and to other Chinese sailors.