It was once theorized that the moon might have deep oceans of dust, potentially a problem for any craft landing on its surface. I've heard that NASA was concerned about this possibility in the early days of the Space Race.

**Is there any evidence that deep lunar dust was an actual concern at NASA?**

Apparently the depth of the lunar dust has become a topic of discussion for young-Earth creationists, making it incredibly hard to search for useful information about the topic.