fantomaster - 11:51 pm on Feb 29, 2000 (gmt 0)

What you are probably seeing is the initial crawl by which search engines will check during or shortly after submission whether the submitted site is accessible at all. If so, your site will be placed in queue for
later extensive crawling.

Also, you might make a point of putting as many links to your other web pages as you reasonably can (you can use invisible links nicely, too, so there shouldn't really be a limit), as this will help you get your site
deep crawled faster. Note, however, that there are only so many deep crawling engines left these days, so you will be best advised to submit every single page individually as you won't get them into most SE indices otherwise.