What Are the Chinese Building Underground in Hainan? 🎥 c-skwgYOpmyal5rv7T | Channify

A satellite captures an image that uncovers the entrance to an underground complex. What is being built there? Don't miss new episodes of WHAT ON EARTH? Tuesdays at 9/8c on Science! http://www.sciencechannel.com/tv-shows/what-on-earth/ Subscribe to Science Channel: http://www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. http://bit.ly/SCI2YT Download the TestTube app: http://testu.be/1ndmmMq