This is submarine "Typhoon" as it was called in NATO documents or "Shark" as it was called in Russia. It is considered to be the biggest submarine in the world, with over than 170 meters (515 feet) long and 23 meter (70 feet) wide. It can carry 20 ballistic nuclear missiles
and there were only six of those built. Only 3 left intact, but are staying now out of service with armament control blocks detached according to the agreement between USSR and USA signed by M. Gorbachev. Without those they are way too peaceful.