Data and information exists on so many levels.
http://www.wired.com/2015/06/dark-web-know-myth
Obviously, some of it is more difficult to access than others.
http://www.brightplanet.com/2014/03/clearing-confusion-deep-web-vs-dark-web
https://en.wikipedia.org/wiki/Dark_Web
https://en.wikipedia.org/wiki/Deep_Web_(film)
https://en.wikipedia.org/wiki/Deep_Web_(search_indexing)
http://blog.dictionary.com/dark-web
http://www.pcadvisor.co.uk/how-to/internet/what-is-dark-web-how-access-dark-web-3593569
http://computer.howstuffworks.com/internet/basics/how-the-deep-web-works.htm
http://computer.howstuffworks.com/internet/tips/information-about-me-online-.htm?utm_source=Outbrain&utm_medium=Referral&utm_campaign=OutbrainOrganicTraffic=obinsite
