Kaluga "is one of the quietest Russian submarines. He also has other advantages that sailors celebrate. The commander of a diesel-electric submarine, Oleg Mikholap, notes:" The boat showed itself quite well, especially in winter, when we entered the port of Severodvinsk. Despite the fact that the ice was thick 2-30 centimeters, she received no damage. This is a very reliable and good ship. "
Submarine Kaluga arrived in Severodvinsk for repairs back in the 2002 year, but due to the lack of funds to work on it, it began only in the 2010 year. Now the plant is upgrading another diesel submarine, the Vladikavkaz.