Using GPR for Detecting a Potential Crypt Beneath a Paved Church Floor

The discovery of written records mentioning an underground crypt beneath the floors of the Church of St. Margaret in Dol pri Ljubljani, Slovenia, lead to further investigations of the area. During a small-scale renovation of the church floor, an area filled with construction waste was discovered, suggesting the underground rooms may have been filled in during one of the previous restorations. A GPR study was carried out inside the church in order to determine whether any air-filled chambers were still present beneath the church floor. Results showed the presence of an underground air-filled chamber, the existence of which was confirmed with a small telescopic camera, lowered through a drilled hole in the floor.