Akhtsu Tunnel is a tunnel

Tunnel

A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...

 on the road between Adler

Adler

The term Adler, the German word for the bird of prey "eagle", is both the last name of many people and an emblematic bird featured on many blazons since the feudal age, including the present German Bundeswappen and at times on the flags of Austria and Germany...

 and Krasnaya Polyana

Krasnaya Polyana

Krasnaya Polyana is the name of several inhabited localities in Russia:*Krasnaya Polyana, Krasnodar Krai, an urban locality in Krasnodar Krai...

 (motorway A148) in the Adlersky City District

Adlersky City District

Adlersky City District is the southernmost of four city districts of the city of Sochi, Krasnodar Krai, Russia, lying along the Black Sea coast near the southern Russian border with Abkhazia, Georgia...

 of Sochi

Sochi

Sochi is a city in Krasnodar Krai, Russia, situated just north of Russia's border with the de facto independent republic of Abkhazia, on the Black Sea coast. Greater Sochi sprawls for along the shores of the Black Sea near the Caucasus Mountains...

, Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

. It goes through the mountain massive on the left bank of the Mzymta River

Mzymta River

Mzymta is a river in Western Caucasus, Russia, flowing through Krasnodar Krai and the city of Sochi. Mzymta is the biggest river in Russia emptying into the Black Sea. Length: 89 km; watershed area: 885 km²....

, in the Akhtsu Gorge.

The length of the tunnel is 2625.7 m. The width is 7 m.

The tunnel was built between 1999—2005. It was opened on 19 August 2005 by Russian President Vladimir Putin

Vladimir Putin

Vladimir Vladimirovich Putin served as the second President of the Russian Federation and is the current Prime Minister of Russia, as well as chairman of United Russia and Chairman of the Council of Ministers of the Union of Russia and Belarus. He became acting President on 31 December 1999, when...

.