Of the Draken-class with sister ships Delfinen, Draken, Gripen, Springaren and Vargen. Displacement 700 tons standard, 835 tons surfaced and 1.110 tons submerged with dimensions 226’4”x 16’7”x 17’4” and a speed of 17 knots surfaced and 20 knots submerged. Armed with 4-21” bow torpedo tubes. Her crew numbered 36 men.
