On July 8, the Russian Navy took delivery of the K-329 Belgorod, the world’s longest nuclear-powered submarine, the Russian submarine builder Sevmash said in a press statement.

Although exact specifications of the Belgorod have not been publicly released, Naval News reports that the Belgorod’s enlarged Oscar II-class hull is estimated to be 178 meters long and 15 meters across, making the sole Typhoon-class submarine the only larger vessel.