It has a peculiar internal structure. The soft slope of the slopes conceals a complex and unusual deep structure. According to AV Lvov, the cape is a hidden terrace-like fault, sprinkled with an ancient crash of huge blocks of rocks, the gaps between which are littered with crushed stone and seized with ice.
Often, the arrays form gaps (up to one meter), sometimes empty, sometimes filled with ice. Sometimes ice is deposited only on the walls in the form of bark or hanging stalactites. One such slit can be walked 85 m away from the tunnel and descend to Baikal under the tunnel. In this case, a strong flow of air through the slits is observed.
Approximately in the middle of the tunnel No. 11 (rings No. 19, 20, from the Kultuk portal), above the vault there is a gap of such width that one can enter there. In some places it is filled with frozen gravelly ground, ice, blocks up to 4 m³.