Graffiti-covered posters of him could also be found in numerous locations, suggesting that he was not loved among the station's population and primarily the Unitologist portion of it. In succession, he also ordered the Titan Station Security Force to eliminate "key subjects" tied to the Marker research project which included Lexine Weller, Nolan Stross and Isaac Clarke. Unable to control the outbreak, Tiedemann declared martial law and ordered an immediate evacuation of all personnel aboard the station. In the multiplayer mode of Dead Space 2, Tiedemann served as the supervisor of a security force unit, instructing and providing directions to the squad as they proceeded with their objectives. Tiedemann did not respond to her hails when she attempted to tell him that she had neutralized the problem in the Reactor Core. He may have not been able to hear the call. Vandal managed to destroy the cause of the Core's problem, a massive Necromorph, but was severely injured in the process. When he discovered that she shut the power down to the automatic seals of the station, he ordered Vandal to go to the station's reactor core before it overheated and destroyed the station. He showed no signs of knowing about Tyler Radikov's influence on Norton's actions. Tiedemann led Engineer Karrie Norton (Vandal) throughout Titan Station's underbelly, citing that it was her responsibility to fix the damage that she caused in the Government Sector. According to one of the audio logs left inside the station, Tiedemann claimed that his grandfather had been running the station long ago.