Some have suggested that this Achievement is a possible reference to the Borealis, an Aperture Science vessel first mentioned in Half-Life 2: Episode Two. In the brief scene (embedded after the break), Isaac Kleiner notes that the Borealis contains some kind of technology that can help humanity. Could Portal 2 tie into the final Half-Life 2 episode? Or are overeager fans simply grasping at nothing? April 20 can't come soon enough.