The church of Kalvin square is found in the center of the Hungarian capital, Budapest. The subsoil layers are very changeable, the groundwater is 4–6 m deep from the surface. Next to the art relic building a 90 m long and 27.5 m wide underground station is being constructed from the surface by cut-and-cover method using diaphragm wall excavation technology. Some effects had to be analyzed which can cause the settlement of the church.

a) the stability of the nearby diaphragm ditch.

b) deviation of the diaphragm wall's direction from the vertical.

c) Settlement depression caused by the construction of the nearby connecting line tunnels.

d) Dynamic effects.

The foundation and the surface structure of the church were strengthened before the beginning of the underground construction. To measure the settlements during the construction there was settled a modern automatic monitoring system, which gives automatic report if the settlement reaches a predetermined value.