Vault 8166 - Classic

Vault 8166 is rumored to be a hidden server on ROBLOX where un-explainable things beyond usual are occurring. It is allegedly a secret map ran by unknown hackers, which have the ability to watch or monitor activity going on between users. It doesn't appear to be a literal vault itself, but it's believed to be a metaphor meaning "Vault/containment of hackers". It is said anyone who goes there can gain access to certain information on ROBLOX and use the Installations, GUIs, and programs. It is then used to create new software, bots, or viruses that are placed and hidden into ROBLOX models or plugins. When inserted into a place, they obtain the ability to interfere with gameplay, local scripts, and even computer monitors. Vault 8166 is described as "the reason behind the ROBLOX website's sudden maintenances". However, it is still unknown whether this server exists, and no solid evidence of its existence has ever been found yet.

= The Leaked User Story = On November 15, 2016, an anonymous user created a new thread on the ROBLOX Talk sub-forum. This user was claiming to had accidentally gotten into this "unknown place" while testing out a teleporter for a game. The thread was a brief summary of how "evil is operating behind our eyes", and that there is a place where dangerous people are gaining access to user profiles and other information as we speak. This secret place was referred to as "Vault 8166". A few hours after the thread was posted, word went out. Mysteriously, the thread was nowhere to be found, along with the user who posted it. The thread may have been taken off by moderators. If not, something else was work, and it wanted it gone. Recently, a user submitted footage of what seems to be a hallway of Vault 8166.