Where is space paranoids in kingdom hearts 2

In the World Map, look at Hollow Bastion. If there is a dark cloud, land. Watch the story. Go to the Bailey and carry on to those steps.. Go down to that door and it should be open (If not, progress through the story then try again). Go through and you should arrive in a different room. Go up towards the castle. When you get to the castle the final fantasy trio (Yuna, Rikku and Paine) should be there around a chest. There will be a cutscene. Then open the chest to get a keybkade. Talk to Aerith. Go into the door below. Go through all of the corridors to get to Ansem's Study. Leon should be there. He should put his hand on the wall and a hole in the wall will open. Go through. If there is a chest, open it. Carry on through to the computer room. There should be a cutscene where Donald triggers a security alert. Then you will arrive in Space Paranoids.