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Deep web -- Underground Web?

In recent times many people are talking about "Deep Web". What it is? Is it Underground Web?

As per my exploration i think the sites which have not been submitted to and crawled by search bots are called Deep Web.

Any one who searches regularly over web has came to know that Google and many search engines don't provide all the results, they skip out the sites which they have not allowed to crawl or not submitted to search engines.

I am planning to work on search engine which can search even the "Deep Web" sites.
Any body out there interested to join me?write comment and keep in touch with me.

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