Laid down at the Portsmouth Navy Yard, USA as the USS Thornbeck (SS418) as a Guppy IIA-class submarine 5 April 1944, launched 7 July 1944, commissioned 13 October 1944 and handed over to Turkey 24 August 1972. Displacement 1.840 ton standard and 2.445 tons submerged with the dimensions 306'0"x 27'0" x17'0". Armed with 6-21" torpedo tubes in the bow and another 4-21" in the stern while she had 24 torpedoes on board. Speed while surfaced 17 knots and submerged 15 knots, with a speed of 10 knots surfaced she had a range of 12.000 miles. Her crew numbered 15 (?) men.
