This track was recorded live in a tube with the number 7244 of the Nord Stream 2 pipeline. Nord Stream 2(former names: North Transgas and North European Gas Pipeline; (Северный поток, Severny potok) is an offshore natural gas pipeline from Vyborgin the Russian Federation to Greifswald in Germany. The singing gets reflected in the tube by creating a rich sound of overtones.
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From @anjoke