Una-class submarine
Boats

Name
Pennant number
Namesake
Builder
Completed
Decommissioned
Fate
Tisa
P-911
Tisa
Brodogradilište specijalnih objekata, Split, SR Croatia, SFR Yugoslavia
1985
1997/2001
extant; to be donated to the Museum of Science and Technology in Belgrade, Serbia. The submarine was delivered to Belgrade in June 2018.
Una
P-912
Una
Brodogradilište specijalnih objekata, Split, SR Croatia, SFR Yugoslavia
1986
1997/2001
extant; Porto Montenegro Museum, Montenegro.
Zeta
P-913
Zeta
Brodogradilište specijalnih objekata, Split, SR Croatia, SFR Yugoslavia
1987
2005
extant; Pivka Military History Park, Slovenia.
Soča
P-914
Soča
Brodogradilište specijalnih objekata, Split, SR Croatia, SFR Yugoslavia
1987
2001/2005
extant; to be donated to a museum
Kupa
P-915
Kupa
Brodogradilište specijalnih objekata, Split, SR Croatia, SFR Yugoslavia
1989
2003
scrapped in 2008
Vardar
P-916
Vardar
Brodogradilište specijalnih objekata, Split, SR Croatia, SFR Yugoslavia
1989
2005
fate unknown (sighted 2 May 2018 on the pier at Pristan Naval Base, Pomorska Baza Pristan, Montenegro, with one other sub of same class)

Question: What was the time duration for which the six boats were completed at the Brodogradilište Specijalnih Objekata (BSO) in Split, SR Croatia?
Answer: All six boats were completed from 1985 to 1989 at the Brodogradilište Specijalnih Objekata (BSO) in Split, SR Croatia.