Many ancient Egyptian coffins and mummy cases have been discovered coated in a mysterious substance. An example is a mysterious discovery found in the coffin of Djed Honsiu-ef-ankh, one of the ancient Egyptian priests who served in the temple of Amun at Karnak. The big temple complex of Karnak was the chief religious hub of the god Amun-Re in Thebes during the New Kingdom—from 1550 to 1070 BC. It is one of the biggest religious complexes in the world. Amun-Re wasn't the only god that was being worshipped in this temple; the complex was also used for the gods Mut and Montu.

Stay tuned to the end of this video to learn more about what was found inside this ancient Egyptian coffin, in a secret world.