In 2017-18 yearas, our good friends and colleagues from GPR24.COM.PL (Poland) took part in the study of crypt in the Church of St. Francis of Assisi, Kraków.

As you can see from the movie, the conditions for working with georadar were very specific

During the study, we discovered 18 crypts, opened 13, but entered and carefully examined 12 rooms of a grave character: nine in the basilica and three in the monastery’s monastery. The remaining underground interiors could be investigated only by non-invasive methods, GPR with confirmation of the video of the endoscope.

Project website http://kryptyfranciszkanow.umk.pl.