Zech arrived at the hallway leading to Davor's private wing. He and two other humans had made it past the guards, blasting their way through with plasma spread-shot rifles. He began searching for digital backwoods and open firewalls he could back into. The sentinel's defenses were formidable. He expected as much. They were sentient machines, after all. He settled for a more manual approach to overcome the tech. He blasted cameras to pieces whenever he saw them, spending precious ammunition to rob the enemy of his sensors. It was a small price to pay to cripple yet another part of the information network Davor undoubtably had set up in his stronghold. He walked to the door. Reinforced, multilayered, electronically locked, and nearly impossible to break through. Nearly. 
He brought out a plasma cutter, set it on maximum, and focused the beam on one spot. It'd take a while, but eventually, everything gives way to a high powered plasma cutter. Plus, he had two more fully loaded in his belt. As soon as they were through, the sentinel would be in for a rough fight.