Archaeologists unearth ancient shipwrecks at the excavation site in Zhangwan Village, Tianjin, May 28, 2012. Archaeologists in Tianjin announced on Monday they have excavated two shipwrecks that were buried for centuries under the Grand Canal. More than 600 artifacts have been recovered from the sunken vessels, which date back to the Ming Dynasty (1368-1644). [Photo/Xinhua]

Archaeologists unearth ancient shipwrecks at the excavation site in Zhangwan Village, Tianjin, May 28, 2012. [Photo/Xinhua]