So, I cant seem to find anything else on this, but I beleive I have found how to get into the room of leviathans breath. It started when I was trying to explore the hanger waiting for a friend to join up and I decided to visit the old datto secret room. (If you know what I mean then I tip my hat to you) When I noticed that when entering the vent shaft to the room, there was a grate over the entrance. Being the curious person I am I decided to look at the room itself when I noticed that the color of the screen had changed and there was a secondary door leaving the room. I then relised it was the entrance to the leviathans breath quest! Does anyone have any info on this???