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Under the right conditions there is not much vibration over long times necessary. Here is a laboratory video from RWTH Aachen, a German technical university showing the process: <a href="https://www.youtube.com/watch?v=ZMWKTuRgJjY">https://www.youtube.com/watch?v=ZMWKTuRgJjY</a> I'm not saying liquefaction was the cause but I in my opinion it shouldn't be ruled out. Regards, Volker
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