India, Nov. 24 -- New survey finds nearly 70% of corals at UNESCO-listed Ningaloo Reef have died.

Australia's most intense and prolonged marine heatwave on record blamed for mass bleaching.

Mortality across eight northern lagoon sites now exceeds 60%.

More than 1,600 corals were assessed in March, but only about 600 survived by October.

Scientists warn the reef is facing unprecedented ecological stress as ocean temperatures surge globally.

The longest-lasting, largest and most intense underwater heatwave ever recorded has decimated nearly 70 per cent of the World Heritage-listed Ningaloo Reef in Western Australia.

Scientists said that between their initial analyses in August 2024 and May 2025, they observed severe bleaching and esti...