 In this Adveniat crypt, whose name reflects the fact that Cardinal Hengsbach was a co-founder of the episcopal charity Bischöfliche Aktion Adveniat, the remains of a canon who had been buried in the atrium in the Middle Ages and discovered during the excavations was buried and in 1991 the cardinal was interred there as well.On 10 October 2004, the newly built south side chapel was dedicated to the memory and veneration of Nikolaus Groß, who was beatified in 2001.The whole church, together with the church of St. Johann Baptist on the front is 90 metres long.