Three ventilation fans appear in the Command Courtyard running over top of the entrance to a vent shaft, blocking it. They are hazardous to Samus if she comes in contact with them. To deactivate them, Samus must use a Grab Ledge next to the fans and roll through several tunnels in the Courtyard until she reaches a chamber on the top walkway of the room. Here, she can remove Energy Cell ID: NE-1202S-6, which stops power to the fans and causes them to stop. Samus can then roll into the tunnel, which ultimately leads to the X-Ray Visor.