The Great Barrier Reef may suffer yet another mass coral bleaching event this year, just months after the last one devastated the planets largest living structure.

Scientists at Australias ARC Centre for Excellence announced Wednesday a team of researchers were preparing to conduct a week-long aerial survey of the reef as the Southern Hemispheres summer came to a close. The surveys echo those made last year in the midst of an unprecedented spate of warm oceans when researchers discovered up to 95 percent of parts of the reef had been bleached.

Were hoping that the next two to three weeks will cool off quickly, and this years bleaching wont be anything like last year, said ARC Centre director Terry Hughes, the lead author of a Nature cover article this week about mass bleaching on the reef, in a statement. The severity of the 2016 bleaching was off the chart.