Construction workers stumbled upon the 15th-century trading vessel in the city of Kampen, buried beneath sand and silt. Archaeologists have raised a medieval ship from a riverbed in The Netherlands, where it had rested for more than 500 years. The 15th-century "cog" was a trading vessel, used to sail the North and Baltic Seas. Construction workers stumbled upon it when they were preparing to excavate the port in the city of Kampen. Measuring 20 metres by eight, it had been buried beneath sand and silt. Experts say its metal joints make it sturdier than other vessels of the same era,...