Sewerstein hinted about work being done with another species. We only recently managed to gain these images as we've managed to track a handful of grunts.
The minimal knowledge we have of the work has been gleaned from notes recovered from the facility. The mutant tribe has been researching, and trying to locate the underground dwelling insectoid faction for some time now. They believe they share a common goal, and can be of help to each other. Survival... survival in the struggle against the dominant society of this plane. The perfected race that would sweep them under the rug, or wipe them out entirely.