It’s spring cleaning time aboard the Magnitogorsk. The submarine has to look its best for the upcoming stand-off with corvette Soobrazitelny. The captain of the latter, Aleksandr Slonov, pays a friendly visit to his old friend and soon-to-be rival, Vladimir Nagornov. To fire up their competitive spirit, the teams of both vessels decide to play a football match. The marines, however, are still on their training, this time driving their armoured vehicles into the sea.