The excavation was preceded by wall research in the church with several probes. Based on previous research, there was concrete evidence of medieval wall decoration, as remains of wall paintings were found on the eastern wall, although these were not made at the time of the foundation, but in the mid-15th century. However, during the wall research, 11th century plaster was found in several places on the vaults and walls, demonstrating that the space had not fundamentally changed from the time of the foundation. The main change was observed in the north and south windows, which was due to the fact that in the 11th century the two sides of the nave were less built-in, so that the windows, which were open then, are now only dead windows. Another important change was observed in the corridors leading down to the crypt. Remnants of the original corridors on both sides were uncovered from under the plaster, showing that they had previously descended into the room at a slight angle, at the two corners of the west side. The early remains of the crypt also include fragments of a poured floor, colored with the bright red powdered sandstone from the area around Lake Balaton, which survives in small patches in the eastern part.