Finally, when the control pushers were found to be cut in half, it was proven that the cut was not caused by the crash, and some traces of the metal alloy the turbine disc was made of was found on the surface of the cut, the sequence of events became clear. The disaster started when "Mikołaj Kopernik" was instructed to climb to a higher flight level. When the necessary thrust was applied to all four engines, the low-pressure turbine of the number 2 engine disintegrated after 9 seconds. One piece of the turbine disc got ejected upwards, not causing any significant damage; the second piece shot into the engine number 1, damaging it seriously; finally, the third piece of the disc shot into the hull, severed the rudder and elevator control rods and destroyed the number 3 engine, causing loss of control over the plane; it also severed power cables for both the flight data recorder and the cockpit voice recorder. This caused the last moments of "Mikołaj Kopernik" not to be recorded.