Vessels were intended to be very habitable in long voyages, with central heating, sauna and even cinema apparatus.

Wartime operation have resulted in several field modifications, of which typical the increase of anti-aircraft armaments, usually at the expense of the amount of carried mines and artillery shells – due to the limited stability of the vessel.

The crew was also provided with small arms (one Degtyaryov machine gun and 15 rifles) for the onshore fire support.

Finally, the minesweepers were capable to carry up to ten 45mm anti-tank guns and up to 600 infantry with light armament.

The intrinsic problems of relatively poor maneuverability and draft too deep for minesweeper (resulting in frequent vessel destruction in minefields) were impossible to fix though.