Gahjae is a class of semi-submersible fast torpedo boat operated by the Navy of the Islamic Revolutionary Guard Corps of Iran.
Allegedly originating from the North Korea as Taedong-C, there are reports suggesting that three boats of this class were delivered to Iran on 22 December 2002.
[1] Gahjae vessels are estimated to have a standard displacement of 7 t (6.9 long tons) and can possibly reach a top speed of 50 knots (93 km/h).
[1] The appearance of these vessels, resembles those of Peykaap-class and they should be close in terms of dimension.
[1] According to Jane's Fighting Ships, the vessel is likely designed for a high-speed approach towards enemy on the surface, and then submerging for almost 3 m (9.8 ft) before using the snort mast for an attack, like Kajami-class.