Well, in the season finale from season 2, the Constructicons were buried with the remaining scraps of the spacebridge. As we seen in the season 3 debut, Bulkhead and Bumblebee went back to the mine to dig for the scraps. So where did the Constructicons go? Are they still buried? Did they dig their way out in between episodes and are just hiding now? I'm pretty sure from other spoilers that they are indeed still alive. I'm just wondering why Bulkhead and Bumblebee did not encounter them while digging. So what theories does everyone have in regards to what happened, and more importantly, how are they going to reappear?