Delta II-class Nuclear Ballistic Missile Submarine

The Delta II-class submarine was a large ballistic missile submarine designed to remedy shortcomings in the Delta I-class submarine. The design was essentially the same, however the submarine was lengthened in the fourth and fifth compartments by 52 feet (15.85 meters) to allow the installation of four more missile tubes. The new type of Delta also received additional quieting measures including having the steam turbines mounted on shock absorbers, having all pipes and hydraulics separated from the hull through rubber insulation, and a special hydroacoustic coating being applied to the hull.

The NATO reporting name, Delta II indicates this submarine as a visually distinguishable new class. The Soviet designation, 667BD Murena-M indicates this submarine is an improved Delta I.

Only four submarines of this class were built, apparently in favor of building the following class, the Delta III-class, and all Delta IIs were out of service by 1996.