to west, and from north to south. It is tall, with the main gold-plated cross extending for more. Its domes have 18 more gold-plated crosses of various sizes, while the bell towers have 49 bells of the Austrian Bell Foundry Grassmayr. The church has a bigger floor area than Cathedral of Christ the Saviour in Moscow, which covers 3980 m2, compared to 4500 m2 of Saint Sava. Saint Sava is also longer 91 m vs 77,7 m and wider 81 m vs 72,42 m, it also has a bigger diameter of its dome 30,5 m vs 25 m. The dome of the Moscow cathedral is higher so, 77,37 m vs 103,4 m. Interestingly, both cathedrals resemble the Haghia Sophia in its structural design, they've been designed based on the arrangement of the central square in the Haghia Sophia. Thus they exemplify the importance of the imperial Byzantine church for main edifices in Orthodox sacral architecture. On the inspiration that was drawn from Haghia Sophia, Deroko noted that two guiding principles were followed in designs for the Church of Saint Sava – the imperative of functionality of planning, and the monumentality of space and form. Looking back at the start of construction, Deroko commented on the challenges of designing a functional space for 10.000 people, which was done with reference to the architects' data, the seminal handbook by Ernst Neufert. He also noted information about the thirty-metre diameter of the dome, making an obviously important comparison with the dome of Haghia Sophia. Although the size of Saint Sava is not necessarily associated with monumentality in Deroko's opinion, the appearance and size of the St. Sava's church greatly mattered as it was to be a monument of national importance. Dome The dome of Saint Sava is built in the classical style as a compound dome with four pendentives from a sphere of greater radius than the dome. It has an inner diameter of 30,50 m and an outer of 35,15 m, resembling the dimensions of the Hagia Sophia (it had initially a realized diameter of 33 m). The dome rests on four 40 m-high vaults, the square of the central space below the dome is 39,72 m wide and occupies 1.578 m2. The double-shelled dome is 27 m high and reaches to 67 m on the outside and on its inner side to 64,56 m height. Thus the dome of Saint Sava