There are areas of the internet unreachable by regular search engines. The "deep web" and "dark web" have given rise to various urban legends, some born from misunderstandings about URLs and domain systems.
First, terminology. The "deep web" refers to all web pages not indexed by search engines. Pages behind a member login and database search results are also part of the deep web. The "dark web" refers to websites accessible only through special software like Tor Browser, using the `.onion` domain.
There is an urban legend called the "Red Room" - accessing a specific URL supposedly shows real-time violent footage. Technically, real-time video streaming over the Tor network faces speed difficulties, which raises doubts about this legend.
"Mariana's Web" claims the internet has layers, with the deepest level containing government secrets and paranormal evidence. This is an unsupported story. Internet protocols define no such deepest layer. URLs point to locations on servers and do not have layers of "depth" like the legend describes.
However, illegal marketplaces do exist on the dark web. In 2013, the FBI shut down an illegal drug marketplace operated on a `.onion` domain. Yet the dark web also hosts legitimate services used by privacy-conscious journalists and activists. Knowing how URLs work technically offers a clue for telling urban legends apart from reality.