Çekmeköy – Sancaktepe – Sultanbeyli Metro Line S21B Structure Diaphragm Wall Works were completed as of January 13, 2022. Within the scope of the project, d=120 cm diaphragm walls were constructed at a depth of 42 m. Following the completion of works, the shoring system was handed over to the client and the excavation works were initiated. As of June 2022, the excavation has reached to 27 m. with a total excavation depth of 32 m, it will be one of the deepest metro project shoring system excavations in Turkey. With this project, whose excavation works are planned to be completed in July 2022, it is aimed to provide a much faster public transportation to Istanbul.