The P-913 submarine was part of the project of building Una-class submarines for the fleet of the then Yugoslav Navy. In the 1980s, the navy came to the conclusion that larger submarines were not suitable for executing a variety of tasks and they were also searching for a more economical approach to enlarging the submarine fleet. In total, six submarines were built and they were all named after rivers from each of the socialist republics in Yugoslavia. The Zeta submarine was built in 1985 in the Brodosplit Special Objects Shipyard in Split. The main task of these pocket or commando submarines was mainly the transportation and support of marine commandos.

The P-913 Zeta submarine represents an incredible example of technical heritage, standing as a testament of the human ability to operate in the difficult conditions of the ocean’s depths. It is also part of our own technical history as the submarine in the Park of Military History allows school and other groups as well as individuals to learn about the amazing contribution of Slovenian knowledge and industrial potential in designing and building submarines as well as the life stories of many Slovenian submariners who served in the Austro-Hungarian, Italian and both Yugoslav navies. Many Slovenian submariners reached the highest military ranks and the number of Slovenians among submarine commanders in the Yugoslav Navy was disproportionately high.