Hoot (Persian: حوت‎‎; Whale) is an Iranian supercavitation torpedo claimed to travel at approximately 360 km/h (220 mph), several times faster than a conventional torpedo. It was claimed to have been successfully test-fired from a surface ship against a dummy submarine during the Iranian military exercise "Great Prophet" (پيامبر اعظم(ص on 2 April 2006 and 3 April 2006.
The official Iranian news agency IRNA claims the torpedo was produced and developed by the Islamic Revolutionary Guards Corps (سپاه پاسداران انقلاب اسلامی . Most military and industry analysts have concluded that the Hoot is reverse engineered from the Russian VA-111 Shkval supercavitation torpedo which travels at the same speed."