 Church archive documents show that the shaft in front of the choir had been opened once before 1843 when the nave of the church was transformed into a commercial warehouse.When the workers lifted the memorial slab labeled number 11, they discovered a grave underneath with three coffins.In 2016, Marie-Louise Gamma and Diana Gysin, members of Basel's citizen-researchers who discover and transcribe historic sources, discovered the relevant text in contractor Blendinger's notes, describing the text on the memorial slab as follows (in the original in German)