With a displacement of 1,640 (surfaced)-1,900 (submerged) tons and as dimensions 57,3 x 6,8 x 6,2 metres or 188’ x 22.3’ x 20’3. Her crew numbered 30 men. Armed with Sub Harpoon missiles and 4-25.6” and 6-21” torpedo tubes. Speed while snorting 11 knots and submerged 20 knots. Diving depth 350 metres or 1,150’.