Как полагают эксперты, они пролежали в земле от 7 до 15 летИсточник:
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http://xn--80aaaf9agbtgd4a3f4b.xn--p1ai/%d1%81%d0%bb%d1%83%d1%87%d0%b0%d0%b9%d0%bd%d1%8b%d0%b5-%d0%bf%d1%80%d0%be%d1%85%d0%be%d0%b6%d0%b8%d0%b5-%d0%bd%d0%b0%d1%88%d0%bb%d0%b8-%d0%bd%d0%b0-%d1%88%d0%bb%d0%b0%d0%bc%d0%b0%d1%85-%d1%87%d0%b5/