Maya ritual cave ‘untouched’ for 1,000 years stuns archaeologists

this is quite interesting and seems pretty promising as far as archaeological discoveries go:

After its initial discovery by farmers in 1966, Balamku was visited by archaeologist Víctor Segovia Pinto, who wrote up a report noting the presence of an extensive amount of archaeological material. But instead of excavating the site, Segovia then directed the farmers to seal up the entrance, and all records of the discovery of the cave seemed to vanish.
Balamku remained sealed for more than 50 years, until it was reopened in 2018 by National Geographic Explorer Guillermo de Anda and his team of investigators from the Great Maya Aquifer Project during their search for the water table beneath Chichén Itzá. Exploration of the system was funded in part by a grant from the National Geographic Society.
De Anda recalls pulling himself on his stomach through the tight tunnels of Balamku for hours before his headlamp illuminated something entirely unexpected: A cascade of offerings left by the ancient residents of Chichén Itzá, so perfectly preserved and untouched that stalagmites had formed around the incense burners, vases, decorated plates, and other objects in the cavern.

“Balamku can tell us not only the moment of collapse of Chichén Itzá,” says de Anda. “It can also probably tell us the moment of its beginning. Now, we have a sealed context, with a great quantity of information, including useable organic matter, that we can use to understand the development of Chichén Itzá.”
Further study of the site will also shed light on the intimate details of the catastrophic droughts that likely provoked the collapse of the Maya civilization. While this area has always been prone to drastic cycles of climate variability, some researchers have suggested that excessive deforestation in the Maya lowlands, which was once home to some 10-15 million people, could have exacerbated the problem and made the entire region uninhabitable.