In In 1931, Archbishop Mederlet SDB, without interfering with the facade of the Church, raised the walls of the Middle aisle by four feet and replaced the old roof with a new concrete roof. A little later, Dr Louis Mathias, SDB, Archbishop of Madras-Mylapore, carried out extensive repairs.
In 1991, Rev Fr. N. A. Joseph SDB, constructed a small hall in front of St. Antony’s altar, attached to the Church, for the convenience of the thousands of devotees that flock to the shrine particularly on Tuesday. The main facade of the Shrine was lined with polished granite in 2000, when Fr. Varuvel Jeromedhas SDB, was pastor, without tampering much with the original architectural design.
Rev.Fr Arokiasamy Tharisus SDB, replaced the tiled-flooring of the hall in front of the altar of St. Antony and the sanctuary around the main altar with white tiles in 2001. In 2006, he further embellished the background of the main altar with a new exquisite design. St. Mary’s Co-cathedral was Canonically raised to the state of an Archdiocesan Shrine by Most Rev. Dr. A.M. Chinnappa, SDB, DD, Ph.D, the Archbishop of Madras – Mylapore , on September 8, 2005.
St. Mary’s Co-Cathedral has had the privilege of witnessing the consecration of Vicar Apostolics, Bishops and Archbishops. The mortal remains of many eminent Vicar Apostolics and Archbishops are interred here.
The Cathedral had an unbroken succession priest since Fr. Ephraim de Nevers, the founder, till today. The ‘shrine’ was finally handed over to the Salesians of Don Bosco in 1928, with Rev. Fr. Niota as the first Salesian Priest. Ever since the Salesian Fathers have been taking care of the shrines till today.