The catacombs take the form of galleries which extended over 5 kilometers and which would contain no less of 15,000 graves. A real necropolis laid out in the basement towards the end of the first century by the Christians to bury their dead there during the times of persecution,
The tombs were arranged in the walls of the galleries on two or three levels. At more or less regular intervals, we note the presence of niches which housed the oil lamps which illuminated this labyrinth with their weak light.
A clandestine cemetery, the Catacombs also served as a place of worship and refuge for the first followers of Christianity and were used until the end of the 4th century.
It was also a space of sacred artistic creation, as evidenced by some of the works exhibited in the Sousse museum: epitaphs and engravings on marble, representing sacred symbols (fish, doves, the Good Shepherd, etc.).