Have you ever heard a coral reef?

From playing ‘lullabies’ through underwater speakers to growing tough super-corals, scientists around the world are battling to save coral reefs. Nearly half of coral species are at risk of extinction and the currently developing super El Niño will further warm an ocean already heated by ongoing climate change. So researchers are turning to unorthodox ideas to help new corals to settle, grow and thrive. In the Caribbean underwater speakers serenade tiny larvae, while in Thailand a low-tech coral hotel raises resilient youngsters. Read more about the coral crisis and how researchers are working to keep the world’s reefs alive: https://www.nature.com/articles/d41586-026-02965-9 Subscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday: https://www.nature.com/briefing Thumbnail polyps image from: Getty Images / Wild Horizon 0:00 - Introduction 0:53 - Why is a reef like a rainforest? 2:13 - Underwater speakers play 'lullabies' to coral larvae 4:51 - Real estate agents for corals 6:13 - Coral IVF 7:15 - Apple's one-star hotel to 'toughen up' the babies 9:00 - El Niño, climate change and the crisis facing the world's reefs 10:41 - Saving reefs needs more than just scientists