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When you get done interrogating clarke,throw all of your grenades towards the tall gray canisters that is filled with nova 6.then shoot the remaining canisters until the screen shakes after it shakes go to the area behing you and on the desk you will see a white tape recorder hold the action button until the screen shakes again. Proceed into the level. When you get to the room that weaver and clarke moves the refridgerator go in that room behind the refridgerator and you will see another tape recorder hold the actin button again until the screen shakes again. Wait alittle while and the thunder gun will appear out of the wall you have to hold the action button again to take it. Now you have a wind blowin killin machine.