This was the Melissa event from a few years back.. had to say a bunch of keywords to get past the locked doors.. think a few were 'eored' and 'martoovexlksrisspince'
There was another teleporter that would take you down to Melissa's lair.
Edit: Also I think this was when the spring cleaning came back around, and you were able to get 25k points by making it down here. Forget exactly what you had to do, but there were lots and lots of ghosts.