I know there has been tons of post about this now but I have not seen any about this spot I just found so I wanted to share.
https://www.youtube.com/watch?v=eX6UJ9CSiwo
It is after the jump maze under the door to atheons room. The second set of platforms to the jump maze (going through the left tunnel) leads right to it which is a good indicator for it. When you are there you can see I am able to see through a wall which looks like a tunnel back there, only problem is how to get it open. Only thing I can think of is not getting spotted by gorgons because my team got caught once and I didn't get to try it that way. Anyone else found out about this spot or have any ideas?