When we started to put together the trilogy of confrontation, explosion and counter-offensive, we saw the opportunity to get Benson out of the Bunker to increase the tension between him and Wood. However, we felt there was a story missing between the time of Benson’s departure and the positioning of the assault team. So we developed “The Chasm.” We already had this story in the back of our minds, but decided this was the right time to flesh it out.