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

[1][2] Hospital ship Ob was decommissioned in 1997 and may have been sold to the People's Liberation Army Navy, as it was mentioned[by whom?

[citation needed] The size of the crew when deployed was nominally 124 sailors and 83 members of the medical staff.

The on-board hospital has 300 beds, or in the event of an emergency (e.g. evacuation) for a short time up to 650 passengers.

The propulsion system consists of two Zgoda-Sulzer 12ZV40 / 48 diesels, each with an output of 7800 hp, driving two propellers.