For those of you who came in late, the RoboMat is a training facility for the cadets (and even graduated heroes) – think Danger Room but with robots instead of hard light holograms. It was first seen in Chapter 4 here, and then again in a full training exercise here. Another training exercise was seen in Chapter 5 here and also briefly here in Crossoverkill, the webcomic crossover featuring Hoodoo from Magellan.
So anyway… they have to keep the robots somewhere during their down time, and it would seem Locke Island has control of them now as well. Yikes!