The Polar Express subsea cable is a 12,650km subsea cable along Russia's northern coast between the village of Teriberka in Kolsky District of Murmansk, on the Barents Sea, to the eastern port city of Vladivostok.

The Polar Express subsea cable project is being developed by the Ministry of Transport of the Russian Federation, the Federal Agency for Maritime and River Transport (Rosmorrechflot), and the Federal State Unitary Enterprise (FSUE) Rosmorport. aiming to supply stable internet in Arctic port towns as well as the Kamchatka peninsula and Sakhalin, at a cost of 65 billion roubles ($889 million)，exclusively financed by the state.

The Polar Express subsea cable system will be operated by the Federal State Unitary Enterprise Morsviazsputnik (FSUE Morsviazsputnik). Prior to the Polar Express project, the main activity of Morsviazsputnik was the provision of Inmarsat mobile satellite communication services to legal entities and private users under the license of the Federal Service for Supervision in the Sphere of Communications, Information Technology and Mass Communications.

JSC “Advanced Technologies Management" was selected to manufacture and lay the Polar Express cable. 

The Polar Express subsea cable system consists of six fiber pairs, offering up to 104 Tbps of capacity.

The Polar Express subsea cable is expected to be completed in 2026.