Later two units are Project B-320 II, implying a modification to the basic design; the external differences are minor.

She was laid down on 25 November 1988 and launched on 6 July 1989 by Adolf Barsky shipyard.

[1] In 2016, the modernization of the Irtysh's equipment began, the first phase of which was completed in August.

[2] The objectives of Irtysh now are receiving, distributing, providing medical assistance to the wounded, sick and injured in peacetime or during hostilities.

Organization of events for the rest of crews of ships and submarines at sea.