Archaeologists in Mexico have discovered a sealed Maya “ritual cave” containing a trove of relics that offer new clues about the ancient civilization.

The cave system, which researchers believe had been sealed for 1,000 years, is known as Balamku or “Jaguar God,” and contains at least 150 stunning objects. The findings were announced at a Monday press conference in Mexico City.

According to researchers, the cave’s difficult access and structure increase its sacred qualities, suggesting that it was used for rituals.