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Unless caught in shallow water, an American submarine could dive below the Japanese depth charge attack. The Japanese had used attack patterns based on the older United States S-class submarines (1918–1925) that had a test depth of 200 ft (61 m); while the WWII Balao-class submarines (1943) could reach 400 ft (120 m).
U.S. submarines had been conducting a successful undersea war against Japanese shipping during World War II, frequently escaping their anti-submarine depth charge attacks. [6] [7] May revealed the deficiencies of Japanese depth-charge tactics in a press conference held in June 1943 on his return from a war zone junket.
The Ukuru class was initially armed with 120 depth charges with two Type 94 depth charge projectors, sixteen Type 3 depth charge throwers and two depth charge chutes at the stern. The ships were provided with a Model 93 sonar and a Type 93 hydrophone; later units received the Type 3 Model 2 sonar, and some would later receive an 8 cm (3 in ...
They were built with four Type 96 25-millimeter (1.0 in) anti-aircraft guns in two twin-gun mounts, but the total was increased to 15 guns by August 1943. 36 depth charges were stowed aboard initially, but this later increased by August 1943 to 60 depth charges with a Type 97 81-millimeter (3.2 in) trench mortar [2] and six depth charge ...
A dozen depth charges were stowed aboard initially, but this was doubled in May 1942 when their minesweeping gear was removed. [2] The anti-submarine weaponry later rose to 60 depth charges with a Type 97 81-millimeter (3.2 in) trench mortar and six depth charge throwers.
Two further vessels were never completed. They displaced 940 tons (full load) and carried three 4.7 in (120 mm) guns, two depth charge projectors, six depth charge throwers and up to 120 depth charge. The nine ships of the Hiburi class served as convoy escorts during World War II.
36 depth charges Shiranui ( 不知火 , alternatively Shiranuhi , Phosphorescent Light ) [ 1 ] was the second vessel to be commissioned in the 19-vessel Kagerō -class destroyers built for the Imperial Japanese Navy in the late 1930s under the Circle Three Supplementary Naval Expansion Program ( Maru San Keikaku ).
However, little did the Japanese ships know, they were not alone as the submarine USS Mingo was patrolling the area when she spotted the two ships and prepared to intercept them. Tamanami spotted Mingo and engaged the submarine with depth charges, but inflicted no damage. Mingo in turn fired torpedoes at Tamanami, but she evaded all of them.