The materials of research of the Assumption Cathedral during archaeological excavations one thousand nine hundred and fifty-two years testify: “The study was preserved of internal plaster showed no traces of ancient plaster with  fresco or traces of preparation for a mosaic , which, according to historical sources, was here. Plaster on most of the internal fragments turned out to be two-layered. The bottom layer is very thick – up to 12 cm in forged nails and with a large amount of coal in the form of specially burnt twigs, which served as a frame and for lightening the weight. The second layer – thin – 1-1.5 cm – lime plaster with preparation for oil painting. The first layer is characteristic for the XVII – early. XVIII century., And the second refers to the end of the XIX century. “. “The study of the walls in the process of dismantling debris (1962-63). It showed that the ancient plaster with a fresco remained fragmentary only under the laying of the openings of the northern wall … It is now clear that almost all the plaster of the XI century and later eras was shot down at the end of the 19th century and replaced by a new lime plaster ”[125].

Excavations of the Ruins of the Assumption Cathedral in 1962-63 The “Ancient core of the monument is a three-nave, three-apsidny, six-pillar church. Narteks is separated by a wall connected with a western pair of pillars. The northern and southern interapsid walls are connected with the eastern pair of pylons. The basic dimensions of the plan of the ancient part of the monument are: the length along the central axis east-west is 35.57 m, the internal length is 32.97 m, the width along the south-north axis is 24.30 m, and the internal width is 21.62 m.

The main wall thickness is 130-135 cm. Cross-shaped pylons with a branch size of 130×58-60 cm.

The dimensions of the dome space at the base of the pylons are 8.60 x 8.63 m.

The extension of the annexes of the southern, northern and stairwells from the west, the “dimensions of the monument” were increased in the south by 9.5 m, and in the north by 11.15 m, in the west by 8.5 m. ”

Excavations of 1962-63 He testifies: “On the most part of the area of the ancient core … in the vestibule of the northern side-chapel and in the stairwells the floors were preserved from metlakh tiles made during a major renovation in 1893. The tiles are laid on cement mortar on a brick and concrete base. At the porch site at the western entrance, lay the floor with black granite slabs. Also made of granite. but red is made of salts and the degree of a solea, passing through all three naves. The coverage level of salt is 42-45 cm above the floor of the aisles.

Underfloor devices are made for air heating. Annie is a system of canals: brick walls and a vault in which heating pipelines are laid … Brick channels run from the main canals – sleeves that reach the floor level, they are completed with cast-iron grates through which heated air enters the cathedral.

… In the altar parts of the monument are solid underground connected with the canals. The undergrounds are covered with brick arches on metal beams. ”

By preliminary advancement of the Ruins The following was established:

– Foundations in the epicenter of the explosion are absent. Within a radius of 8-10 m from the epicenter of the explosion, the foundations were partially protected;

– foundations within a radius of more than 10 m were almost completely protected;

– the foundations of the XVII-HUIN centuries. Generally, they are sufficiently strong material;

– the above-ground part of the Assumption Cathedral has been preserved in the form of separate half-destroyed walls with a height of 0.5 to 8.0 meters. All walls have a slope of 10 to 250 mm. The arches and vaults are completely destroyed.

“The throne (main altar) is mounted on a metal frame and lined with silver gilded slabs – remnants of the throne 1755″ Unfortunately, only fragments found in 1953 remain among the ruins … Among the Ruins … a pleasant impression is made by the ornamental fringe rim throne, interpreted in the spirit of Ukrainian embroidery “[32].

During the excavation of February 1963 Poltava settling the altar, judging by the inscriptions. It is from the altar of the main altar: “In the annex of John the Baptist, a 2-chamber box with silver utensils and utensils for the participle, brushes in a metal frame, a salary of the throne, etc., gold-plated copper clock , facing the altar were found .. . in the center of the lining – relief composition “Baptism.”

During the archaeological excavations of 1962-63. Almost all the elements of the facing of the altar were found.