been in that room under the terminal it happened randomly during a heroic version of the promethean code where ikora sent me to kill a taken centurion for a quest, you scan the computer and cayde says his usual s**t then the platform starts to descend cayde says "wait, where are you going?", down in the room there is a large door that opens and the centurion walks out, the room on the other side of the door has some computer terminals in the centre of the room but you cannot interact with them. got a feeling this was part of an exotic quest because the symbol was yellow with a sword which usually indicates an exotic quest.
edit: as it turns out this was for the touch of malice quest
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Yea same thing happened to me nothing speical down there