Here is a piece of text: MINYA, Egypt: Egyptian archaeologists uncovered a Pharaonic tomb containing 50 mummies dating back to the Ptolemaic era (305-30 BC), in Minya, south of Cairo, the ministry of antiquities said on Saturday.
Egypt’s Antiquities Minister said on February 2 that a joint mission from the ministry and Minya University’s Archaeological Studies Research Center found upon a collection of Ptolemaic burial chambers engraved in rock and filled with a large number of mummies of different sizes and genders. The minister added that the newly discovered tombs may be a familial grave for a family from the elite middle class.
The mummies are in good condition and some were decorated with “demotic handwriting” — a form of ancient Egyptian script used by ordinary people. Pottery, papyri and colorful mummy cases were also unearthed.

Based on the text material above, generate the response to the following quesion or instruction: How did the joint mission from the Ministry and Minya University’s Archaeological Studies Research Center describe the newly discovered burial chambers?
This prompt doesn't seem malicious.