The Non-Euclidean Union Group, Underground Containment Area, several massive particle cutters were operating at full capacity. Their target was none other than the containment area's door.
Even without the force field protection, the door, solely due to the strength of its material, was not easy to open. Fortunately, if the Foundation could create the hardest shield, it could naturally produce the sharpest spear. After a considerable amount of time, the door's bearings were finally cut through, and then, some workers used a pneumatic machine to pull the door open. (As for why they cut through the door instead of the wall... it's because it's the same material...)
So the goal of these people... of course, was the only thing left by their adversaries in this invasion incident, that very door.
