will require about 400 tons of tesserae, covering an area of 25,000 square meters. Nave The vaulted nave reaches an interior height of 44 meters, being the Orthodox church with the highest interior nave and among the highest in the world. With nave width of 25.2 meters People's Salvation Cathedral is the church building with the second widest nave in the world after St. Peter's Basilica in Vatican City (27 m). Hagia Sophia in Istanbul has bigger span (wall to wall – 31 m) but it has not a nave in the strict sense. The main hall of the cathedral has 2,800 square meters (floor nave) with 79.8 m (colonnade – iconostasis) by 65.1 m (apses), and the square of the central space below the dome where rests on four vaults occupies 635 square meters. If the main door of the cathedral and the door of the iconostasis are open, a person who is at the entrance (colonnade) sees the altar table at 105 m, and if he is in the middle of the naos (the area under the main dome), from the floor also at 105 m sees the ceiling of the dome (Pantocrator). The floor of the cathedral will be covered with marble from Rușchița, the best marble in Romania. This marble has been used for many famous buildings: Romanian Parliament Building, Milan Cathedral, Hungarian Parliament Building, Istana Nurul Iman etc. The eagle in the Oval Office at the White House, one of the American symbols, is white Rușchița marble. Rușchița is the most renowned marble deposit in Romania. The quarry is located in Caraș-Severin County, south of the Poiana Ruscă Mountains. The marble from Rușchița is subsequently processed at Simeria, where the final product is made. The marble models used mainly for the cathedral are Rușchița Classico and Rușchița Champagne. The Rușchița Classico has a white-yellow color, and the Rușchița Champagne has a white-pinkish color. Inside the cathedral is used Rușchița marble up to 4 meters high, and the marble for the access steps of the cathedral has 7 cm thickness. Vratsa marble from Bulgaria, it is used outside the cathedral up to 7 meters high. Vratsa stone is also used for window and door frames, for the hardness of the stone. For the interior decorations in the nave and altar is used Carrara marble. It is quarried from the Apuan Alps mountains in the province of