Please check one of these walkthroughs for details:
http://www.gamefaqs.com/search/index...ons&platform=0
I think the PS2 walkthrough is actually a 360 one but I should imagine that the guidance it gives will be just pretty much the same. Just scan down until you reach the part you are stuck on.
I did try to search for sub basement but it didn't find it so I can't help narrow down the info.
Hope this helps!
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