NMS Sublocotenent Ghiculescu was a specialized ASW gunboat of the Romanian Navy.

She was built at Arsenal de Brest, being launched in 1917 and commissioned by the French Navy as Mignonne in 1918.

After attacking, the submarine was located by a German BV138C flying boat, and Sublocotenent Ghiculescu together with sister ship Stihi Eugen were sent to the scene.

The two Romanian gunboats attacked the Soviet submarine with depth-charges, sinking her with all hands.

[13][14] During the night of 27 April, a convoy escorted by the Romanian gunboat Sublocotenent Ghiculescu, the German submarine hunter UJ-115, one R-boat, two KFK naval trawlers and 19 MFPs (including the Romanian PTA-404 and PTA-406) engaged the Soviet G-5-class motor torpedo boats TKA-332, TKA-343 and TKA-344, after the three attacked and damaged the German submarine hunter UJ-104.