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Mizuho off Tateyama, Japan, in 1940.

Career (Japan)
Name: Mizuho
Laid down: 1 May 1937
Launched: 16 May 1938
Commissioned: 25 February 1939
Fate: Sunk 2 May 1942
General characteristics
Class & type: Mizuho
Displacement: 10,930 tons standard
Length: 183.6 meters (602 ft 4 in) (waterline)
Beam: 18.8 meters
Propulsion: 2-shaft diesel engines, 15,200 bhp (11.3 mW)
Speed: 22 knots
Armament: 6 (3 x 2) 14cm (5.5-inch)/50-caliber guns, 12 x 25mm anti-aircraft guns
Aircraft carried: 24 seaplanes

Mizuho (瑞穂?) was a seaplane carrier of the Imperial Japanese Navy during World War II. The ship was built at Kawasaki Shipbuilding at Kobe, Japan, and was completed in February 1939.[1][2]


[hide] *1 Construction


Mizuho was built to a similar design as the seaplane carrier Chitose, but with slightly less powerful diesel engines instead of Chitose's turbines.[3] She carried 24 seaplanes,[1] and was equipped to carry twelve miniature submarines,[1] although she could not carry full loads of both at one time.[3]


Mizuho participated in invasion support for much of her career;[1] her first mission was with the Fourth Surprise Attack Force.[2] On 1 March 1942, planes from Mizuho and Chitose damaged the American destroyer USS Pope (DD-225), which was later sunk by aircraft from the aircraft carrier Ryujo and gunfire from the heavy cruisers Ashigara and Myoko.[4]


The American submarine USS Drum (SS-228) torpedoed Mizuho at 23:03 hours on 1 May 1942 40 nautical miles (74 km) off Omaezaki, Japan. She capsized and sank at 04:16 hours on 2 May 1942 with the loss of 101 lives. There were 472 survivors, of which 31 were wounded.[3][5][6]


  1. ^ a b c d Toppan, Andrew (Jun 25, 1998). "World Aircraft Carriers List: Japanese Seaplane Ships". Retrieved 2009-07-04.
  2. ^ a b Budge, Kent. "Mizuho, Japanese Seaplane Carrier". The Pacific War Online Encyclopedia. Retrieved 2009-07-04.
  3. ^ a b c "IJN Mizuho Seaplane Carrier". Retrieved 2009-07-04.
  4. ^ Tully, Anthony. "IJN Mizuho: Tabular Record of Movement". Retrieved 2009-07-04.
  5. ^ "USS Drum". Retrieved 2009-07-04.
  6. ^ IJN Mizuho Tabular Record of Movement

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