Sometime in the third or fourth century A.D., a Roman merchant ship carrying tin and pottery sunk in the Bay of Morlaix, on the northern coast of France. Recently rediscovered by a local diver, archaeologists are now eager to learn the secrets of the shipment of tin the Roman ship was carrying, Spero News reports. Because the Mediterranean is devoid of major tin lodes, ancient Greeks and Romans who wanted to produce bronze, used in coins and tools, had to search abroad for tin to add to their copper, which was readily available in Cyprus.