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@JW_Cartoonist @blueicehiggins @peter_neff @Scripps_Polar @sciencejenna @GeosciencesPU @US_IceDrilling Yep! The sound ricochets off the walls of the hole so that the waves coming out first are higher pitched than the ones that take longer to bounce around and end up coming later. Some Japanese TV channel made this pretty helpful graphic showing what I mean: