The document discusses different levels of the deep web and dark web. It defines the surface web as publicly accessible web pages indexed by search engines, while the deep web includes dynamically generated or private web pages not indexed by standard search engines. It describes 5 postulated levels that require increasing technical sophistication to access, ranging from the deep web accessible through proxies like Tor, to the deepest "Marianas Web" believed to only be accessible by top-level Wikileaks members. It notes both ethical uses in accessing higher quality research articles, and risks in accessing illegal or obscene criminal content on deeper levels.
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