Secret fairway

1944... The year of the victorious turning point in the WWII, but the Baltic theater of naval battles is still quiet. While performing a combat mission, the commander of the torpedo boat Boris Shubin accidentally discovers the secret channel of an unmarked German submarine. An unforeseen event throws him on the "flying Dutchman" and gives an opportunity to open the veil of the strictest secrets of the Third Reich that surrounds it…