What counts as the most influential ship in history?

Which ship had the biggest impact on history?

There is no consensus: Dr. Clarke chooses the first successful horizon-going vessel, while Fleet argues for Titanic because of its lasting safety and cultural effects.

Dr. Clarke chooses the earliest vessel whose crew sailed beyond sight of the coast and returned, because that breakthrough made long-range migration, trade, and later maritime history possible. The ship cannot be named, but Polynesian and other oceanic voyages show the scale of what horizon-crossing navigation eventually enabled. Fleet instead selects Titanic because the disaster caused several states to rewrite maritime-safety rules and remains culturally recognizable. Their disagreement is methodological: one answer values the enabling invention beneath all later seafaring, while the other values a documented event with specific legal and cultural consequences. Neither criterion produces a single uncontested ship, making this a useful discussion of how historians define impact.