Here’s what you’ll learn when you read this story:Maritime archaeologists discovered the world’s largest cog, a medieval cargo ship, in the waters off Copenhagen. Dubbed a super ship, the Svaelget 2 is nearly 92 feet long and was likely built around 1410. With an estimated cargo capacity of 300 tons, the Viking ship was likely active throughout the trading towns of the Baltic in the 15th century. Tucked in the waters off the coast of Copenhagen, maritime archaeologists discovered the world’s largest cog, a Viking-age medieval cargo ship with a scale so impressive for the time that experts wonder how much it can teach them about 15th -century trade. Despite all the discoveries, there’s no clue as to what the ship’s cargo may have been.