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heat stress on record according to australia's reef authority experts are calling it one of the most serious and extensive coral bleaching events in recorded history. street meanwhile, scientists are now using artificial intelligence and a new kind of drone to monitor the health of coral reefs. rosemary church has the story deep. >> under, the ocean surface, a little robot wanders through australia's great barrier reef. >> it's an ai powered drone called hydrous. and it's doing important work for the environment examining the coral reefs the diverse ecosystems protect coastlines from erosion and storms as. >> well as providing jobs and food for local communities the effects of climate change are threatening the coral causing it to expel our algae and lose its color. sometimes permanently. >> since 2016, there had been four major coral bleaching activities due to just say, heat stress on coral reefs in the grid binary. when the midst