The interior of the church has five aisles or vessels, the main with an interior height of 37metres. The pilasters are constructed of local stone from Mar del Plata. The ground is covered in finely polished granite so that it acquires the appearance of marble, and the great characteristic strength of the material. The stained glass windows are of French or German origin, but at this level everything is far from being completed. The workshop of stained glass works at La Plata create new ones.
Many artists have worked to build this great sanctuary. Noteworthy is the work of Mahlknecht brothers, with the Austrian sculptors Leo Moroder and Michel Shenke who have created remarkable wood carvings, the crucified Christ, carved from a single piece (except arms) in a timber guatambu oak cross. The brothers Mahlknecht sculpted the choir, the throne of the archbishop and the confessionals. Moderate carved the statue of Mary that is near the archbishopric.
The Cathedral Museum is located in the crypt where they show models, drawings, plans and religious objects too. There are historical photos and instruments, as well as carving patterns and other ornaments. This museum is intended to raise awareness of the need to know and protect cultural heritage in general and the city in particular.
Video by Primashock Aerial