"The Navy has decided to complete the construction of two Lada-class boats and stop the work on the project. All three boats of this project will join the Baltic Fleet. Funding will be directed to the Kalina project," the official told RIA Novosti.
He added that a Russian design bureau, Rubin, was working on the project of the submarines equipped with anaerobic (air-independent) power units, dubbed Kalina-class. Their construction is expected to be launched after 2020.
Air-independent, closed cycle submarines, which usually use hydrogen-oxygen fuel cells, are quieter than conventional diesel-electric boats and do not have to surface or use snorkel tubes to breathe air, thereby exposing themselves to detection by radar and other sensors.