This impressive underground multichambered complex is articulated around a subterranean aule (open-air court), with rock-cut burial chambers to its west, north and east sides. During the 2020-22 archaeological investigation, the remnants of the south wall of the aule were revealed, possibly representing the original elaborated facade of the complex. Hypogeum A bears impressive architectural decoration, recalling those of the monumental tombs of Macedon. The walls of the aule are decorated with Doric semi-columns, forming a pseudoperistyle. False-windows are traceable in the intercolumniation.
This unit consists of two chambers. The first hosts 4 loculi in each long side, arranged between Ionic semi-columns. The Ionic doorframes of the loculi were originally sealed with slabs. The back wall of the chamber has a temple-like façade, with a triangular pediment, supported by four Ionic semi-columns. It provides access to the second chamber, which is occupied by two rock-cut sarcophagi in the form of symposium klinai (banqueting benches), an indication of Greek-elite lifestyle. Traits of painted decoration are still visible on the walls.
A small burial chamber with 8 loculi is situated to the west side of the court. Loculi were originally sealed with slabs bearing painted decoration.
Behind the north wall of the aule, there is a vestibule, the walls of which are decorated in relief with semi-opened false-windows. In the west side of the vestibule, there is a burial chamber with 17 loculi. Some of them were found sealed with slabs bearing painted or relief imitations of doorways. Above the frame of a loculus of the north side, one can still read: ΦΙΛΟΤΕΚΝΕ ΧΑΙΡΕ (farewell Philoteknos). In the east side of the vestibule, there is a stone bench and two loculi, once used as ossuaries. A gate to the north wall of the vestibule leads to another corridor with a 12-loculi burial chamber to its east side and a room for practical purposes to its west.
To the west of Hypogeum A, the ruins of two minor burial complexes were discovered, Hypogea B and C.
The towers, some of which still stand in the site, were once topped with grave stelai or altars marking burials of individuals in rock-cut pits, beneath them.