page_title: Midget submarine
section_title: Japan
hierarchical_section_title: Midget submarine / Types by nation / Japan
caption_attribution_description: 日本語: しんかい6500（横浜港開港150年での母船よこすかの船内開放での撮影）
context_page_description: A midget submarine is any submarine under 150 tons, typically operated by a crew of one or two but sometimes up to 6 or 9, with little or no on-board living accommodation. They normally work with mother ships, from which they are launched and recovered and which provide living accommodation for the crew and support staff.
  Both military and civilian midget submarines have been built. Military types work with surface ships and other submarines as mother ships. Civilian and non-combatant military types are generally called submersibles and normally work with surface ships.
  Most early submarines would now be considered midget submarines, such as the United States Navy's USS Holland and the British Royal Navy's HMS Holland 1.
context_section_description: Type A Kō-hyōteki-class midget submarines were used in the 1941 attack on Pearl Harbor, the 1942 attack on Sydney Harbour, and the 1942 Allied attack on Diego Suarez Harbor, in which the type 97 torpedo was used operationally. The wreckage of one of the submarines sunk at Pearl Harbor was located by NOAA's Hawaii Undersea Research Laboratory (HURL) in August 2002.  Photographic analysis conducted by the United States Naval Institute in 1999 indicated that one of the five Ko-hyoteki-class submarines managed to enter Pearl Harbor, and successfully fired a torpedo into USS West Virginia. On 29 May 1942, one of two midget submarines managed to enter the Diego Suarez harbor and fire two torpedoes. One torpedo seriously damaged the battleship HMS Ramillies, while the second sank the oil tanker British Loyalty (6,993 tons).
  Type B Kō-hyōteki-class Midget Ha 45 prototype built 1942 to test Type A improvements.
  Type C Kō-hyōteki-class Midget Ha 62–76 similar to Type A with crew of 3 and radius increased to 350 nautical miles (650 km) at 6 knots (11 km/h) surfaced or 120 nautical miles (220 km) at 4 knots (7.4 km/h) submerged.
  Type D Kō-hyōteki-class, also called Kōryū class (115 completed) improved Type C with crew of 5 and radius increased to 1,000 miles (1,600 km) at 8 knots (15 km/h) surfaced and 320 miles (510 km) at 16 knots (30 km/h) submerged.
  Kairyū-class submarine
  Kaiten submarine suicide torpedo.
  DSV Shinkai research submersible, capable of diving to a depth of 6.5 kilometres (4.0 miles)
caption: DSV Shinkai
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