Internet
Decades of high innovation and private interests have resulted in the creation of a wide range of incompatible computing technologies. Their wild implementation with no common direction or regulation eventually resulted in the internet becoming “layered.”
The first layer is the most basic. Anyone with a modern computer, WorldsOnline® access, or a cyberjack can access the public content there. This is the CityNet, popular search engines, commercial websites, games, social networking, etcetera.
The next few layers all require increasingly complex and expensive software and hardware upgrades in order to access the information and users there. These layers exist as much for elitist purposes as they do for secretive purposes. Typically the more knowledgeable, competent, and wealthy the users/ admins are, the “deeper” into the internet they will prefer to be.
Layer 2: Requires at least $5,000 worth of software and hardware upgrades.
Layer 3: Requires at least $50,000 worth of software and hardware upgrades.
Layer 4: Requires at least $250,000 worth of software and hardware upgrades.
Layer 5: Requires at least $1,500,000 worth of software and hardware upgrades.
Layer 6: Requires at least $10,000,000 worth of software and hardware upgrades.
The existence of a seventh (or deeper) layer is a rumor; a myth. What lies there, if “there” even exists, nobody knows. No-one’s ever been able to prove that they’ve credibly gone that deep into the web.