Sava-class

The Sava class was a series of diesel-electric attack submarines developed by the Brodarski Institute as project B-72. Built at the Brodogradilište specijalnih objekata in Split, the class was designed to replace the Sutjeska-class submarines. Two units were completed: Sava (P-831), commissioned in 1978, and Drava (P-832), commissioned in 1982.

The design utilized a single shaft driven by diesel engines and an electric motor. Compared to the preceding Heroj class, these vessels featured increased automation and a greater maximum diving depth. Armament was housed in forward-facing torpedo tubes capable of launching either torpedoes or naval mines. The sensor suite included a surface search radar and a radar warning system.

The submarines were assigned to the 88th Submarine Flotilla based at the Lora Naval Base. In October 1983, Drava experienced an underwater hull breach attributed to a design flaw. During the Croatian War of Independence, the class was relocated to Boka Kotorska and integrated into the navy of the Federal Republic of Yugoslavia. Drava was decommissioned around 1999 following a suspended overhaul. Sava was decommissioned in 2002 and declared redundant in 2004. Ownership passed to Montenegro in 2006 following its independence. After attempts to sell the units as operational warships failed, both vessels were sold for scrap in 2008. Drava was dismantled in Tivat, while Sava was towed to Turkey for breaking.