Stanislav Nikolski

The film begins in the 1980s Soviet Union. Two best friends, Orlov and Muravyev, are serving at the Black Sea Navy Base in Sevastopol, Crimea. Both fall in love with one beautiful girl Nelly, and their friendship suffers a first blow. Because she picks Muravyev, his friend Orlov struggles with an inferiority complex and becomes a secretive alcoholic. After the collapse of the Soviet Union in 1991, both friends are transferred to the Northern Fleet on the Polar Ocean. One day their sub is performing a routine training. A disturbed WWII mine slowly moves on a collision course with the sub. A mighty blast knocks down everyone inside the wrecked sub, 72 meters below the sea level. Then ensues a nerve-racking struggle for survival.

Russian Empire. The second decade of the twentieth century. As a result of the conflict between the Entente and the bloc of the Central Powers led by Germany, which erupted in August 1914, Russia is drawn into the First World War. A wave of unrest is rolling through the country. Revolutionary moods are increasing every day. Counterintelligence is trying with all its might to suppress the activity of German spies active in the territory of the country ...

Lieutenant Captains Pyotr Orlov and Ivan Muravyov have been serving on the Slavyanka submarine for a long time. The next trip to the sea is a planned combat exercise. But no one assumes that a catastrophe will happen this time — the waves from the training explosions will disturb the "sleeping" naval mine since the Second World War.