Synopsis
A heroic saga about strong-willed men.
They are always on duty. They are the crew of the submarine B – 556, known by NATO as The Black Hole. They have different ranks, different roles, and different backgrounds.
Inside the enclosed metal world, work goes on day and night, although neither day nor night exists in the sub.
An ongoing fight with nature, with harsh conditions, with oneself - this is where real men are created.
Their courage, oath of loyalty, honor - all these merits help the crew overcome the hardships life throws at them.
But some unexpected events will ask for more than any man can give...
