 What we can see from the data that we have is that this entrance has a length of about 30-80 meters, and probably then there will be an extended cavity in the subsurface. However, we cannot look further with respect to the entrance. Leonardo, looking at your paper, I realize, I didn't know this, that there's been quite a lot of talk about these very deep pits that have been seen on the surface of the Moon, and quite a lot of them.