Archaeologists reveal a medieval super ship: "It's the World’s largest cog"

For 600 years, the waters off Copenhagen have hidden an exceptional secret. Now, maritime archaeologists from the Viking Ship Museum in Denmark reveal the discovery of the world’s largest cog – a medieval cargo ship whose size and previously unknown construction details offer new insight into the maritime technology and trade networks of the Middle Ages, shedding light on the scale and organisation of medieval trade across Northern Europe.