Dark Nebula Lab was a lab created by Jedi Master Kahar Zamet , an ally of Dark Nebula, on Mustafar. He then gave Xalandra Nova control of the lab. Xalandra made Kahar in charge of all projects in Dark Nebula Lab. Several projects have been made since the lab opened in December 2011. No photos or videos are allowed to be provided, as the projects there are top secret.
The Defenders, Kahar's Resistance against the Empire, lasted from 19 - 2 BBY. During these 17 years, the lab was used as their headquarters.