Final answer:
Zheng He sailed aboard large ships during his expeditions. The ships were technologically advanced and capable of navigating different waterways. The fleet was impressive due to the size and technological superiority of the ships.
Step-by-step explanation:
Zheng He sailed aboard a fleet of large ships during his expeditions. The largest ships were 425 feet long, over six times the length of the caravels used by Columbus. These ships were four-decked, 1,500-ton flagships with shallow drafts and watertight bulkheads. They had nine masts fitted with rattan sails and were built for military personnel transport. Zheng He's fleet was impressive because of the size and technological superiority of the ships, allowing them to navigate various waterways and establish trade relationships throughout South Asia.