People that have played different versions of Civilization will remember the Triremes. They couldn't end a term in the ocean, only the coast. However, you coul

People that have played different versions of Civilization will remember the Triremes. They couldn't end a term in the ocean, only the coast. However, you could take a punt and travel over the ocean - with only the hope there was land on the other side. Horribly expensive, but discovering new land or another civilization early could be transformative for the same.