 The Troubles and inflation led to long delays and major problems with the financing of this work.The south transept, containing the Chapel of Unity, and with the organ loft above, was dedicated in 1974, and the north transept, with the large Celtic cross designed by John MacGeagh on the exterior, and housing the Chapel of the Royal Irish Rifles, was completed in 1981.In April 2007 a 40-metre stainless steel spire was installed on top of the cathedral.