Marine archaeologists have found a shipwreck dating from the 13th century off the coast of Japan . Historians say the first Chinese attempt to invade Japan in 1274 ended in disaster . The ship was discovered in December by an expedition led by Professor Hiroshi Kitajima at Japan's National Museum of Nature and Science (NMNH). More than 4,000 artifacts , including pottery shards , cannonballs and anchors were found near the wreck .
Marine archaeologists have found a shipwreck dating from the 13th century off the coast of Japan . The ship was discovered in December by an expedition led by Professor Hiroshi Kitajima at Japan's National Museum of Nature and Science (NMNH). More than 4,000 artifacts , including pottery shards , cannonballs and anchors were found near the wreck .