Tunnel Sadd Ariana company was established in 2007 with the cooperation of some accomplished, like-minded managers based on their valuable experience acquired in multiple large-scale construction projects. This company obtained the highest rankings of Construction and Consultation Services as well as Design and Build of roads from the Planning and Budget Organization of Iran in a short period of time in continuing its rapid progress throughout the years after establishment. this company became a successful and pioneer contractor with various branches. This achievement is due to the focus on providing outstanding services and professional commitment, unrelenting endeavor, continuous quality enhancement, customer-oriented policies, reducing costs and construction time, applying modern methods and technologies, as well as employing experienced personnel and developed equipment and modern machinery. Due to these factors, this company was awarded as an exemplary national exporter of engineering and technical services for five consecutive years from 2017 to 2021. Ariana group consists of several subsidiaries such as Behan Sadd Consulting engineers company (which provides engineering and consulting services for dam and power plant projects), Tajikkan consulting engineers companies (which specialize in providing design, consultation, and engineering services), and Sokhtmoni Tunnel company (which offers services in urban projects in the Republic of Tajikistan). While operating independently, these companies have an integrated management system. In order to efficiently supervise all foreign and domestic projects as well as the subsidiaries, Ariana group's headquarters is located in Tehran, Iran.