The Sava class was a class of diesel-electric attack submarines built for the Yugoslav Navy during the late 1970s and early 1980s. Developed by the Brodarski Institute (BI) from Zagreb, the two strong class was built by the Brodogradilište specijalnih objekata (Special objects shipyard) in Split. They were intended as a replacement for the aging s. Compared to the earlier , the Sava class was longer with more powerful armament that consisted of six torpedo tubes that could also be used for minelaying.

With the start of the Croatian War of Independence, both submarines were relocated to Boka Kotorska where they would be commissioned with the new FR Yugoslav Navy of, what would eventually become, Serbia and Montenegro. Both were decommissioned during the early 2000s.

Development and building 
The Sava class was developed by the Brodarski Institute (BI) from Zagreb, SR Croatia as a replacement for the two  boats in service. The project, designated B-72, was led by Colonel Dušan Radanović who was succeeded by Branko Ryšlavy. Compared to the previous Heroj-class attack submarines, the new class was to have a greater degree of automatation with improved armament and autonomy including greater diving depths.

Both submarines, Sava (P-831) and Drava (P-832), were built by the Brodogradilište specijalnih objekata (Special objects shipyard) in Split, SR Croatia and named after rivers in SFR Yugoslavia. Sava was laid down in 1975, launched in 1977 and was commissioned in 1978. It was the second submarine in the Yugoslav Navy to carry that name, the first one being Sava (P-802). Drava was laid down in 1978, launched in 1981 and commissioned in 1982.

Description 
The submarines measured  in length displacing  surfaced and  when submerged. The diesel-electric drive consisted of two MTU diesel engines and a Končar  electric motor mounted on a single shaft, enabling the boats a speed of  when surfaced and a maximum speed of  underwater. The boat's maximum diving depth was  and were manned by a crew of 35.

Armament consisted of six  forward facing torpedo tubes used for launching a complement of up to ten TEST-71ME torpedoes with a maximum range of  or up to twenty naval mines if used for minelaying operations. Sensors include a "Stop Light" radar warning system and a "Snoop Group" surface search radar. Sources are somewhat conflicting regarding installed sonar equipment.

Service and aftermath 
Both Sava and Drava were part of the 88th Submarine Flotilla of the Yugoslav Navy, with the Lora Naval Base in Split being their homeport. In October 1983 while underwater Drava suffered a hull breach which almost resulted in the submarine and its entire crew being lost. It was revealed that the cause of the breach was a design flaw in the submarine itself. With the start of the Croatian War of Independence both submarines were relocated to Montenegro where they were eventually commissioned with the FR Yugoslav Navy. The major overhaul of Drava was stopped in 1996 and the boat was decommissioned sometime around 1999. Sava was decommissioned in 2002 and was officially declared redundant in 2004, being not operational for some time by that point. The submarines were passed on to Montenegro after the country declared independence in 2006, and after unsuccessful attempts at selling the submarines as complete warships, in 2008 it was decided that they were to be sold for scrap or as museum exhibits.

Drava was sold and scrapped in June 2008 in Tivat. On 8 May 2008 Sava was sold as scrap for 174,500 Euros to the Podgorica firm "Mont Metal" and was towed to Turkey for scrapping. An article published in 2010 suggested that the submarine was sold along with the "Orca-2000" system still on board, although it was supposed to be removed along with the other sensitive combat equipment. "Orca-2000" was a torpedo fire control system that could also be used for navigation and was developed in Serbia and Montenegro . A few days later Rajko Bulatović, commander of the Montenegrin Navy at the time, made a statement explaining the "Orca-2000" system was never installed on Sava, and was in fact, developed for a foreign customer.

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Submarines of Yugoslavia
Submarine classes