A Mexican government archaeologist says his team has found a tunnel-like passageway that apparently leads to two sealed chambers in Mexico's Templo Mayor complex. It's the latest chapter in the search for the as-yet undiscovered tomb of an Aztec ruler.

The Aztecs are believed to have cremated the remains of their leaders during their 1325-1521 rule, but the final resting place of the cremains has never been found.

Archaeologist Leonardo Lopez Lujan says the 8.4-meter (27-foot) long tunnel was found leading into the center of a circular platform where dead rulers were cremated.

The mouth of the tunnel was sealed by a 3-ton slab of rock, with offerings underneath. At the end of the tunnel, archaeologists can see two sealed entrances.

Outside experts said Tuesday the find would be significant.