This is one of the security posts of the school.
Here Dr. Glass was seen often taking care of wounded and/or sick members of the 2nd Mass. It was here that the resistance began successfully removing the Harnesses without killing the children. The Skitter that Tom Mason captured in Prisoner of War was eventually kept here.
Appears to have a lot of parts from various electronics. It is also the room where they build a radio, out of a radio kit. The room was also used to make the first skitter jammer. They also developed a bullet that can destroy a mech. It was also here that Pope built the bomb intended to be used in the Assault on Boston.
This is were the 2nd Mass stores their weapons and ammunition.