 NASA officials say they have confirmed that not far from where astronauts Neil Armstrong and Buzz Aldrin made their historic moon landing 55 years ago, scientists have now discovered a cave. And researchers say there could be hundreds more caves and tunnels, which they say could potentially house future astronauts. An Italian-led team reporting today there's evidence of a sizable cave accessible from the deepest known pit on the moon in the area of what's known as the Sea of Tranquility. It's believed to have been created by the collapse of a lava tube.