In 1974, the first in an extensive collection of clay figures was discovered in Xi'an, China, leading to the discovery of an ancient tomb housing a number of artifacts. National Geographic Explorer Albert Lin gives us an exclusive look at the 8000 warriors that make up the Terracotta Army, and why they were created for the first Emperor of China 2000 years ago. China’s Megatomb: Secrets of the Terracotta Army, premieres Sunday 20th June at 8pm on National Geographic UK. | National Geographic UK