Giant Hole on the Moon May Lead to Secret Tunnel System

If you look up at the Earth's satellite, the Moon, you'll see that its surface is peppered with thousands of craters. Those are caused by asteroids and meteorites colliding with the lunar surface. But it also has over 200 holes that might even lead to caves. Scientists from around the world keep an eye on them and wondering if they may lead to an underground tunnel system... Learn more about your ad choices. Visit megaphone.fm/adchoices