Unlocking The 5th Monitor. Its a cipher from bungie linked through the Owl Sector. The cipher references (Rijndael) A.E.S. A system of encryption. See link below ://en.m.wikipedia.org/wiki/Advanced_Encryption_Standard The encryption grid reminds me of the sub floor (the round things you can walk on) in the room where the 5th monitor is locked. All the sections of the floor are numbered : 01, 02, 03, ...20, 21, 22, and so on. I think this is our puzzle to open the diamond and activate that monitor. . Now I don't know anything about code or encryption, but I am damn sure this is the answer. Please bump, comment, share this... Whatever we need to do for the right people to see this and crack the code to this (possible) position based puzzle. May be players trading positions in a specified order on the light up floor section. Need more input on this one