Expired domain finder plugin and depth

Please could I have a little clarification on the meaning on 'depth' when setting up the expired domain finder finder?

If I have the depth set to '1' then I never find any expired domains. Do I understand correctly that setting depth to '1' means that the expired domain would have to be on the homepage of the target URL?

For example, if I set the depth to '3' would it scrape as deep as http://example.com/blah/blah/blah ?


Cheers!