01. World’s first submarine used in combat was named as “turtle” and it was used during the American revolution war in 1775
02. The biggest submarine in the world is BS-329 Belgorod owned by the Russian Navy.
03. The smallest submarines ever made were Biber used by German military during WWII.
04. The fastest submarine in the world was Soviet submarine K-222. It could reach 44.7 knots (83 km/h; 51 mph), fully submerged.
05. Submarines are not only used for military purposes. There are submarines that are being used for marine science, salvage and exploration
06. The largest unmanned submarine is The US Navy LSV-2 Cutthroat. It is 33.83 m (111 ft) long, 3.05 m (10 ft) wide, and weighs 205 tonnes (451,950 lb).
07. The longest submerged and unsupported patrol made public is 111 days (57,085 km 30,804 nautical miles) by HM Submarine Warspite (Cdr J. G. F. Cooke RN) in the South Atlantic from 25 November 1982 to 15 March 1983.
08. The largest target ever sunk by a submarine was the Japanese aircraft carrier Shinano (72,890 tonnes or 160.9 million lb), sunk by USS Archerfish (Cdr Joseph F. Enright, USN) on 29 November 1944.
09. Currently North Korea owns the largest number of submarines in the world. They own 71 submarines by 2023. USA and China have place in second and third places respectively.
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