A robot photographed an ancient urn at the bottom of lake that's been spitting out mysterious artifacts

Since the 1920s, pottery spanning thousands of years has turned up in Lake Biwaka. Archaeologist don’t know why. A robot has photographed a nearly intact ancient urn at the bottom of Japan’s largest freshwater lake, according to Japanese national paper the Asahi Shimbun. Over the last century, a number of pottery pieces representing a huge range in timeline have been recovered from Lake Biwako in central Japan; archaeologists have no idea why.
Read more: http://www.newsweek.com/ancient-urn-discovered-robot-bottom-japan-biggest-lake-mystifies-761537?source=Snapzu