From mass coral bleaching to destructive fishing, coral reefs – the "rainforests of the ocean" – are on the brink of collapse. CGTN takes you beneath the waves, into an XR-built seabed, to explore how coral reefs come to life, why they are disappearing at unprecedented speed, and why their future is connected to ours. Watch the full documentary and hear the whispers of the reef – a warning, and a hope.