ARKHANGELSK, June 17. /ITAR-TASS/. Russia's Navy has put into service the first Yasen K-560 nuclear attack submarine, produced by the country's largest shipyard. A flag-hoisting ceremony on the new submarine took place in Severodvinsk on Tuesday.

The Severodvinsk, a 4th generation vessel, has logged 14 sea trials lasting 222 days in total, dozens of thousands of nautical miles, and hundreds of divings.

It features a new hull and armaments architecture, state-of-the-art communications and navigation systems and an advanced power unit. Its displacement is 9,500 tons, with length at 120 meters, diving depth at 600 meters, and a speed of 31 knots /about 57 kilometers per hour/. It carries a crew of 85.

Under a state armaments program, Sevmash will build seven Yasen and Yasen-M class submarines armed with cruise missiles.

The Severodvinsk has become the 131st nuclear submarine built at Sevmash for the Russian Navy. Sevmash, which is Russia's largest shipyard, is building two new generation submarines: Yasen-class attack submarines and Borei strategic submarines.