An underground vault was found last week during the ongoing excavations in ancient Amphipolis.
The vault was discovered in the third chamber of the mysterious burial monument. It measures 4×2.1m.
Archaeologists also uncovered the second marble door leaf. It measures 2×0.90×0.15m and weighs 1.5 tonnes.
Earlier last week authorities stated that no evidence of a gateway leading to the fourth chamber had been found during the dig.