from The New York Times -
Archaeologists Unveil Majestic Roman Ruins That Rival Riches of Pompeii
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An unusual find that was kept from public view for more than 4 decades - which may be in some ways good from a preservation angle. Even then:

"Humidity has forced conservators to detach many frescoes from walls and transfer them onto panels before returning them to their original locations. 'It’s necessary, but it causes immense sorrow whenever we have to do that,' Mr. Pellegrino said."