The official investigation Scrutiny , after most of the wreck was raised Cause_change_of_position_on_a_scale along with analysis of pieces of debris , concluded that the crew of Kursk was preparing GetReady to load Placing a dummy 65–76 `` Kit '' torpedo when a faulty weld in its casing leaked Motion high-test peroxide ( HTP ) , causing Causation the torpedo 's kerosene fuel to explode Bodily_harm .