 All these countries have sent orbiters around the moon taking pictures. They've taken pictures of the Apollo landing sites. They've taken pictures of all the geological features. I think the bigger mystery is what's underneath. You know, there's a lot of obvious holes in the moon, these lava tubes and lava pits and large tunnels there. And from the radar soundings they've been able to get, it looks like some of these tunnels are as big as the city of Pittsburgh.