Having started in October 2017; a total of 7,400 m² diaphragm wall works within the scope of Deep Excavation Support System of Higher Education Building of Bahçeşehir University Beşiktaş Campus has been successfully completed by using hydraulic cutter. Design of 22.5 m deep excavation support system of this project; which is located along the shoreline of Bosphorus and adjacent to the actively used existing education buildings was performed by ourselves. As a result of the analysis, a diaphragm wall supported by steel struts was chosen as the most suitable shoring system. In order to reduce the buckling length of long steel struts; which had to be used due to geometry of the site, additional barrette piles were also constructed. Due to the on-going archeological investigation works, the excavation works have not yet started.