Kola Superdeep Borehole. Source: wtfacts.org/ Read more about the hole: en.wikipedia.org/wiki/Kola_Superdeep_Borehole. reached lli, (403591?) just to , geep the Kola Superdeep Borehole Source: wtfacts org/ Read more about the hole: en wikipedia org/wiki/Kola_Superdeep_Borehole reached lli (403591?) just to geep
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