A.I.M. was revealed to be behind the pocket dimension of Earth-13584 by using a sliver of time they obtained to alter certain events so they can obtain the technology and science from various individuals. They did this by exploiting the fluid nature of time brought on by the manipulations of Kang the Conqueror traveling back to alter the past. This lasted until the Dark Avengers ended up in this reality causing it to collapse. The Dark Avengers were able to get out before the pocket dimension collapsed.