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
Coral larvae settled most near the speaker, with bacteria-coated structures showing stronger results than artificial surfaces alone. A reef may be built from concrete and carefully engineered structures, but for young marine life, it appears that the right soundtrack could matter too. In Hawaiʻi, scientists have been experimenting with an unusual approach to reef restoration,…