Blackwall

The Blackwall is a firewall developed by NetWatch. Located within the Net, it is tasked with keeping rogue AIs from breaking through into the rest of cyberspace and wreaking havoc.

The firewall often splits old network systems in half, leading to stories of haunted data.

2040s
In the 2040s, NetWatch created an immense firewall they named the Blackwall. Its task was to divide a secure area of the Net for human use and hold the threat of the dangerous rogue artificial intelligences released in the cyberspace during the DataKrash caused by Rache Bartmoss. Humanity was forced to sacrifice its access to invaluable resources and knowledge for the safekeeping of the Net.

2077
By 2077, the Blackwall is still active as the danger of the rogue AIs getting free could possibly cause the end of the world. However, a number of netrunner groups believe the free AIs will help them conquer the virtual world, and thus look for ways to destroy the firewall. To ensure this never happens, NetWatch works overtime to keep others from destroying it.

It is revealed by various sources that the Blackwall is not a firewall, but actually a powerful AI masquerading as ICE, whose job is to keep out any rogue AIs it can identify from the secure net. It is also referred to as a band-aid solution, due to fact that the Blackwall, being an AI, could go rogue itself. The Voodoo Boys believe that outcome is inevitable, and are willing to do anything to remove the Blackwall and win favors with the rogue AIs for when they return.

The image of Alt Cunningham reveals that the best way to survive beyond the Blackwall is by assuming a human form so as to not turn into pure data, out of animalistic behavior.

Depending on the choices at the end of the game, either V or Johnny can agree to follow Alt Cunningham beyond the Blackwall, where they can fuse with her or roam free.