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Mechanical bound states in the continuum (BICs) present an alternative avenuefor developing high-frequency, high-Q mechanical resonators, distinct from theconventional band structure engineering method. While symmetry-protectedmechanical BICs have been realized in phononic crystals, the observation ofaccidental mechanical BICs -- whose existence is independent of mode symmetryand tunable by structural parameters -- has remained elusive. This challenge isprimarily attributed to the additional radiation channel introduced by thelongitudinal component of elastic waves. Here, we employ a coupled wave theoryto predict and experimentally demonstrate mechanical accidental BICs within ahigh-aspect-ratio gallium arsenide phononic crystal grating. We observe themerging process of accidental BICs with symmetry-protected BICs, resulting inreduced acoustic radiation losses compared to isolated BICs. This finding opensup new possibilities for phonon trapping using BIC-based systems, withpotential applications in sensing, transduction, and quantum measurements.

Merging mechanical bound states in the continuum in high-aspect-ratio phononic crystal gratings