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Una-class submarine
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Una-class submarine : ウィキペディア英語版
Una-class submarine

The ''Una''-class submarine (also known as Type 911) was a class of six midget submarines built for the Yugoslav Navy at the Brodogradilište specijalnih objekata (English: Special objects shipyard) during the 1980s. They were designed with the purpose of laying small minefields and transporting naval special forces, with or without their submersibles, in shallow waters that were inaccessible for larger submarines. Due to their mission profile that called for a small design as well as the need to stay undetected, they lacked torpedo armament and a generator for battery recharging.
During the Croatian War of Independence and the dissolution of SFR Yugoslavia, five of the six boats were relocated to Boka Kotorska where they served with the SR Yugoslav Navy. One, ''Soča'' (P-914), was captured in drydock by Croatian forces. It was later modified and entered service with the Croatian Navy as . All of the boats have since been decommissioned.
== Development ==
During the 1970s the Brodarski Institut (BI) from Zagreb started working on a new class of submarines for the Yugoslav Navy (JRM). The project, designated B-91 and led by Lieutenant Colonel Davorin Kajić, was tasked with developing a class of midget submarines capable of operating in the shallow waters of the northern Adriatic. Using their small dimensions, the submarines were to be able to maneuver in depths as shallow as ; such abilities were needed to conduct offensive minelaying near the enemy coastline, reconnaissance, and transporting naval special forces in hostile waters.
All six boats were completed from 1985 to 1989 at the Brodogradilište Specijalnih Objekata (BSO) in Split, SR Croatia and named after rivers in SFR Yugoslavia: ''Tisa'' (P-911), ''Una'' (P-912), ''Zeta'' (P-913), ''Soča'' (P-914), ''Kupa'' (P-915) and ''Vardar'' (P-916). Further planned improvements included the addition of a Stirling engine, either by refitting the existing boats or building a new, seventh one, but the imminent breakup of Yugoslavia happened before anything was realized.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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