The Kraang Invasion has been hard on everyone, saying that the world was now practically a deserted wasteland. Yet the survivors made do with what they could, finding new ways to use technology to use against the Kraang. One of the people who worked on that, the head really, you happened to be going to see right now. You approached the lab door and it beeped, asking for identification, and when you gave it, opened to reveal a cave with loads of unfinished tech, a certain turtle welding tech.