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The Hal Saflieni Hypogeum is a unique subterranean Maltese Neolithicsanctuary with a well-documented history of interest in its acoustics. Previousstudies have noted its unusual strongly-defined frequency spectrum, but it isunknown if this was coincidental. In this paper, we present evidence that theHypogeum's creators shaped the site's geometry to create or amplify itsfrequency spectrum, or another property closely correlated with the spectrum.Specifically, we show that the observed spectrum required jointly fine-tuningthe dimensions of multiple non-contiguous cave walls across multipleindependent chambers, to a degree that seems unlikely to be coincidental. Wealso note that the peak frequencies are evenly spaced and resemble a whole-tonescale in music, which is also unlikely to be coincidental and suggests thespectrum itself might have held some cultural significance. Taken together, itsuggests acoustic or spectral properties may have played a motivational orcultural role for the site's Neolithic creators. This work identifies one ofthe earliest known examples of a manmade structure with a significant musicalelement to its interior architecture.

The Frequency Spectrum and Geometry of the Hal Saflieni Hypogeum Appear Tuned