During the Second World War, the Nazis had a secret project that was not made known to the public. Very little is known about it.
The project is first mentioned in Severance, when HABIT tells Noah Maxwell that he worked with the Nazis, and that they were working on a project that was not made known to the public. One man that was working on this project was named Sebastian, who occasionally wrote in a journal.
This journal is now in possession of Noah's grandfather Karl, and it can be assumed that it contains confidential information about the project and what the Nazis were looking to achieve with it.
- One assumption is that it involved the development of a wunderwaffe, or wonder weapon, that may be capable of controlling or destroying Slender Man