The first direction of the project is to lay a backbone fiber-optic cable between Azerbaijan and Kazakhstan through the seabed of the Caspian Sea. At the end of 2018, telecommunication operators AzerTelecom of Azerbaijan and Transtelecom and KazTransCom of Kazakhstan signed a Memorandum of Corporation to build a Trans Caspian Fiber Optic Cable Line (TransCaspian Fiber Optic - TCFO) in order to form a digital telecommunication corridor between Europe and Asia. The total length of the Trans-Caspian Fiber Optic line will be 380-400 km. The maximum data transmission capacity of the backbone cable line will be up to 400 terabits / s. The cable line will be laid between Sumgait and Aktau geographical points.

The interstate agreement “On organization of activities by communication operators of Azerbaijan and Kazakhstan in relation to the joint construction, ownership and operation of fiber optic transmission lines along the bottom of the Caspian Sea on Azerbaijan-Kazakhstan route” was signed between Azerbaijan and Kazakhstan on March 19, 2019.

The agreement was approved by Azerbaijan on April 11. The interstate agreement was approved by Kazakh government on May 17, 2019.

The official ceremony dedicated to the launch of works in Kazakhstan territory on the construction of Trans Caspian Fiber Optic (TCFO) cable line through the bottom of the Caspian Sea between Azerbaijan and Kazakhstan was held on November 19, 2019, in Aktau. Prime Minister of Azerbaijan Republic Ali Asadov and Prime Minister of Republic of Kazakhstan Askar Mamin, other public officials, as well as the management of participating in the project telecom operators, attended the ceremony of launching the construction of the Trans Caspian Fiber Optic in Kazakhstan territory.

In September 2022, between the telecommunication companies of Azerbaijan and Kazakhstan - AzerTelecom and Kazakhtelecom was signed a strategic partnership memorandum on the project of laying a fiber-optic cable line along the bottom of the Caspian Sea in frame of the "Digital Bridge" international technological forum held in Astana.

The document envisages a strategic partnership between the two operators within the framework of the Trans-Caspian Fiber-Optic cable project on the Azerbaijan-Kazakhstan route. The Trans-Caspian Fiber-Optic cable project is part of the large-scale "Digital Silk Way" project, which provides for the formation of a digital telecommunication corridor between Europe and Asia.

In January 2023, AzerTelecom and Kazakhtelecom, have signed an "Agreement on the terms of cooperation" within the framework of the project on laying a fiber-optic communication line (FOCL) along the bottom of the Caspian Sea. The agreement is the essential document of the strategic partnership and defines the main terms of cooperation between the two companies within the framework of the previously signed memorandum.

In June 2023, AzerTelecom and Kazakhtelecom signed a Shareholders’ Agreement to establish a joint venture for the construction and operation of the Trans-Caspian Fiber-Optic Communication Line along the Azerbaijan-Kazakhstan route on the seabed of the Caspian Sea. This agreement marks a significant milestone in the project, as it represents the collaborative efforts and actions of the parties towards its finalization. Document outlines the purpose and objectives of the joint venture, with a particular focus on its governance, as well as the construction and operation of the Trans-Caspian Fiber-Optic Communication Line along the Azerbaijan-Kazakhstan route.

“McKinsey and Company”, “Detecon”, “Axiom”, “DLA Piper”, “PwC” and other international consulting and telco companies are involved in the project of strategic importance for both countries.