A 16-tonne coffin hidden with treasures has been found inside a tomb which could belong to the son of China’s first emperor. The discovery comes half a century after the Terracotta Army was located. Archaeologists are now analysing the coffin to determine whether its contents belong to Prince Gao, a child of Qin Shi Huang – the first emperor of China. The tomb is one of nine found in 2011 which is guarded in the afterlife by the Terracotta Army. Despite excavation usually being prohibited, experts began digging after rain threatened to damage the tomb. The coffin appeared untouched by grave ro…