In a Hawaii coral experiment published in October 2026, scientists put an underwater speaker beside 3D-printed structures and bacteria-coated concrete blocks; coral larvae settled on coated blocks but not bare controls

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• Scientists in Kāneʻohe Bay, Oʻahu, placed 37 artificial structures on a sandy seafloor at about 4.5 metres depth and played healthy-reef recordings from an underwater speaker from sunset to sunrise for two weeks.
• Some structures were coated with BRINK, a bioactive coating containing living bacteria meant to mimic chemical cues on natural reef surfaces.