An important element of the works is the archaeological survey and excavation of the sites.

These include a review of historical sources, examination of aerial photographs and geophysical research.

Preliminary investigations are followed by trial excavations to get a clearer picture of whether there are any artefacts or sites in the area that need to be preserved or excavated.

This process aims to balance infrastructure development with the protection of cultural and historical assets.

In the autumn of 2025, archaeological excavations by the National Archaeological Institute uncovered the remains of a Late Avar terraced cemetery. In total, more than 100 graves and artefacts dating from the 8th to 11th centuries were found.
Specialists from the Rómer Flóris Museum of Art and History have uncovered traces of an Arpadian settlement from the 11th century, with houses, ovens, ditches and a clearly visible settlement structure.

The footage has only now been released in order to protect the artefacts, in consultation with archaeologists.

Once the finds were removed, the excavation work for the extension began.