The explosion profoundly affects people in the show, particularly Diggle (…) We went back to the island and we shot what happened on the island in terms of that explosion. Diggle is profoundly affected by it and we’ll see the repercussions of what happened to him on the island throughout the season. Diggle particularly. There are other people that are affected, but Diggle specifically.
David Ramsey reveals some of what will happen in Season 6 with Diggle [Cinemablend.com July 2017]