The Cathedral Church of Saint Saviour was designed by Edmund Thomas Blacket, at that time the Colony's foremost ecclesiastical architect. At Blacket's untimely death, the tower had only been completed to a level just over the tower entrance doorway. The tower has remained a stump for a hundred years. In 1984, the Premier of New South Wales announced the grant of $1,000, 000 for the completion of Blacket's tower and spire, as an Australian Bicentennial Project. The initial phase of the project involved a thorough geotechnical investigation of the existing tower foundations, a search for the original Cathedral stone source and for appropriate stone supply sources for the Cathedral building, and for a comprehensive tour of similar Cathedral bell towers within Australia. As a result of the geotechnical investigations, underpinning of the Tower was undertaken by excavating the core of footing and founding material within the tower, and then by excavating drives in all directions from the center of the Tower. The Tower was backfilled. Building was preceded by preparatory carving of stonework for the Tower. This stonework was either rock faced ashlar stone, or dressed buttress, quoin, and window stone. The construction method for the Tower follows, as closely as possible, the Blacket specification for his Tower.