During restoration work in the Cathedral between 2003 and 2006, the brick and plaster crypt containing the coffins of Bishops Matthew Gibney and Martin Griver was discovered by archaeologists under the floorboards of an aisle in the Cathedral.
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St Mary's Cathedral, Perth, officially the Cathedral of the Immaculate Conception of the Blessed Virgin Mary, is the cathedral church of the Roman Catholic Archdiocese of Perth, and seat of its Archbishop, currently Timothy Costelloe.