Clarification on crawling levels?

just a clarification: in this case level 0 is https://en.wikipedia.org/wiki/ , correct?

I’ve tried advanced crawling with depth of 1 thinking that it would do pages under wiki (thinking that level 0 is https://en.wikipedia.org/wiki/), and frankly it didn’t do a thing. It finished to quickly to be noticed.

Then tried level 2, still same result.

Only when I’ve set it to level 3, then it starts doing “something” and going through the wiki pages for example https://en.wikipedia.org/wiki/charlie_sheen

So I must be misunderstanding something.