Workers started dismantling Notre-Dame’s grand organ on Monday in the hopes that experts can restore it in time for the fifth anniversary of the devastating fire that severely damaged the Paris cathedral.

The organ — the biggest musical instrument in France — was not burned by the flames that destroyed the cathedral’s roof and spire on April 15, 2019. But it was covered in soot and damaged by humidity.

“It is an absolute miracle that it has survived. An organ like this is enormous and looks indestructible, but it is actually very fragile,” Olivier Latry, one of Notre-Dame’s official organ players, told Europe 1 radio.