http://www.callofduty.com/intel/465
There's some racket coming from below, and once that beam starts shining, it just can't seem to keep a steady rotation. Rumors have leaked in concerning access to an underground passage, but as of yet they're unconfirmed. A zipline runs from the top of the building, but the crew just can't seem to get it up and running. This will definitely need some more exploring.
EDIT: So I added some pictures. You can see the broken railing descends into the ice and is sticking out of it all frozen into it funky like.. and then the unlit lightbulb i was talking about..