In August, 1986, a landslide appeared to the south of this fragment at the external part of the wall. Two large trees up to 15 m. high with roots moved down the slope forming a pit about 4 m. deep. Between August and November, 1986, the ground was reinforced by oak piles that laid drainage pipes of asbestos and cement. The pit was filled. This work was carried out by the Architectural Department of the Museum in co-operation with the Monastery economic service. In November 1986, the dangerous area was investigated at the Museum request by Doctor of Geology S.N. Chernyshov, Professor of the Moscow Engineer and Construction Institute named after Kuibyshev. He stated that the landslide was formed by the upper layers of the ground moving down because of excessive moisture. In November, 1986, the examination of this area by Moscow Region Geology Department proved the conclusions of S.N. Chernyshov. In 1987, the water collecting system at the western fortress wall was examined, cleared and repaired. In 1989, to the north of the fragment, reinforced in 1983, cross-cut and oblique cracks appeared and there arose a necessity of emergency repairs. The permanent examination, timely preventive works and repairs maintained the results of the restoration of the previous decades. The architectural ensemble of the Trinity-St. Sergius Lavra is a unique phenomenon in Russian culture. It must be treated with great care and concern.

G.A. Makarovskaya’s article was published in:
Sergievo-Posadsky Musei-Zapovednik. Soobshcheniya 1995. Izd-vo “PIK”, M., 1995.

Due to the efforts of the restorers the architectural ensemble of the Trinity-St. Sergius Lavra was inscribed on the UNESCO List of the World Cultural Heritage in 1993.