Built at the Uljanik Yard, Pula ; Split Shipyard, displacement 1170 tons surfaced and 1350 tons submerged with as dimensions 64 m x 7.2 m x 5 m. The engines allowed a speed of 10 knots surfaced and 16 knots submerged. Her crew numbered 55 men and she was fitted out with 6 533 mm bow torpedo tubes and take with her 10 torpedoes or 20 mines.
