The Belgorod, the world"s largest nuclear submarine, has been delivered to the Russian Navy, equipped with the Poseidon nuclear-powered torpedo, raising concerns among Western nations. This former Soviet-era submarine, modified from the 949A class, now stands out as a massive 300,000-tonne vessel, dwarfing even Russia"s most advanced Nimitz-class submarines. Its launch signifies a new era in underwater warfare capabilities.