Translations:Друга лінія оборони: дерев'яні стіни на скелях/1/en

The builders of the Tustan fortress made very good use of the natural terrain and supplemented the rocks with wooden structures. The second line of defence was a 2.90 m wide and 13 m high wooden wall which began at the foot of the Velyke Krylo.

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  Вигляд фортеці з першою та другою лініями оборони. Рис.Яблонського

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  Перша лінія оборони: дамба, став, вал та дорога

At the junction, two vertical grooves were cut into the rock - they are still visible on the rocks as parallel lines. The cavity between the two wooden walls below was filled with small stones to make the structure massive and strong.