The primary purpose of Borei-class submarines is almost unimaginably grim: to bring ruin to an adversary’s cities, even should other nuclear forces be wiped out in a first strike. The Borei is the most advanced SSBN in the Russian Navy. On May 22, 2018, the Russian submarine Yuri Dolgoruky slipped beneath the waves of the Arctic White Sea. Hatches along the submerged boat’s spine opened, flooding the capacious tubes beneath. Moments later… – The National Interest