Man this is so fucking stupid.
The deep web is the most overhyped load of bullshit around. The deep web is basically things you cannot access via public search engines (Google, Yahoo, etc.)
You know what else you can't access publicly? Your email. You're not going to find someone else's inbox on a Google search.
Other things include private messages on forums, passworded sections/areas that require a specific type of account on websites (i.e. moderator sections on forums), private torrent trackers, etc. Only a very, very small fraction is what you're mentioning.
The romanticization of the deep web is getting way out of hand. Anyone who actually thinks these things are interesting need to fucking go outside.
If you could just spend some time looking at articles about the deep web then you would know that all those "private" things that you're mentioning doesn't really have to do with what the deep web is about. Not being listed in search engines is just part of that. The deep web in general requires a special access using a Tor network, moreover some sites even require direct access through a specific highly secured connection. The "deep web" also includes government archives as they are shared between private and extremely secured infrastructures.