The St. Petersburg is a Project 677 diesel submarine developed by the Rubin design bureau, whose export version is known as the Amur 1650. It features an advanced anti-sonar coating for its hull, an extended cruising range, and advanced anti-ship and anti-submarine weaponry, including Club-S cruise missile systems.
"The sub is undergoing sea trials to test new propulsion, electronics and weapons systems," Vice Admiral Oleg Burtsev said.
The construction of the sub began in 1997 at the St. Petersburg's Admiralty Shipyards. Two other submarines of the same class - the Kronshtadt and the Sevastopol - are being built by the company.
The Lada class vessels will gradually replace the Kilo class submarines, which are sometimes called "Black Holes" for their uncanny ability to "disappear," and are thought to be one of the quietest diesel-electric submarine classes in the world.
The Russian Navy is planning to commission a total of eight Lada class submarines in the future, the admiral said.