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. This urn is an example of Haji pottery, earthenware characterized by a rusty reddish-brown color that came from being baked. It measures roughly 12 to 16 inches tall, with the opening at the top measuring roughly 8 inches across, and it likely dates to the seventh or eighth century, according to the newspaper Asahi Shimbun.