The Greek Choir, or Katholikon, belongs to the Greek Orthodox, who have separated it from the rest of the edifice, leaving it open only to the Anastasis. Katholikon
During its restoration, the foundations of Constantine’s Martyrium Basilica were discovered beneath the Crusader floor.
The dome is covered with mosaics in the Byzantine style. The cosmic idea of universal redemption through the death and resurrection of Christ is symbolically represented by a marble basin under the dome known as the Omphalos, or Navel of the World.