The Lost Archive is a downloadable content addition for Assassin's Creed: Revelations, with gameplay similar to the Desmond's Journey sequences. It follows the life of Clay Kaczmarek, also known as Subject 16 of the Animus Project, and was released on 28 February 2012. The content was first hinted at when a set of achievements was leaked on 14 February 2012, which were later added to Revelations via the 1.03 patch.