On April 23, 2019, a hulking submarine named the K-139 Belgorod was christened and launched from Severodvinsk, Russia. It slid from Sevmash Shipyard into the Nikolskoye estuary off the White Sea. First laid down in 1992, the Belgorod is the world's longest submarine, surpassing Russia's Typhoon-class nuclear-missile sub and the US Navy's Ohio class. Its construction was paused for over a decade in 2000 after the disaster aboard its immediate predecessor, the Kursk—in which all the crew was lost after an explosion during missile tests. But Belgorod was resurrected with its design modified for a new purpose: carrying the Poseidon nuclear-powered, nuclear-armed torpedo "drone.To read more, click here.