Russian nuclear sub starts sea trials after overhaul

A Russian Delta-IV class Karelia nuclear submarine has started sea trials following lengthy modernization at the Zvezdochka shipyard in northern Russia, the company said.

The overhaul, which started in 2004, included noise reduction, improved enemy ship and submarine tracking capabilities, and enhanced survivability. The submarine has been equipped with 16 Sineva RSM-54 missiles.

K-18 Karelia could join Russia's Northern Fleet by the end of this year, the shipyard said in a statement on Wednesday.

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