|Desperate War of Japan in the Pacific|
|Plan to visit Europe by submarine|
Yoshida Shigeru was arrasted by Kempei because he had a copy of Konoe's address to Mikado for peace on 15 April 1945. Yoshida visited vice admiral Ozawa and asked whether a submarine of IJN could ferry him to Europe in June 1945 in order to negotiate a peace treaty. Yoshida was told to go by Akizuki. Akizuki was a son of Lord Akizuki. Ozawa was a son of samurai of Akizuki Han. His wife was a daughter of Akizuki clan.|
Why did Yoshida think of Siberia Railways? Russia approved of Japanese diplomat's commnunicating to Europe.
USN used submarines were used to rescue air crews. A damaged B-29 flew to the surface where a submarine waited for bailing out crews off 1 mile coast. The submarine merged on the surface in 10min. How did submerged rescue submarines receive wireless signals? For example, USS Archerfish had patrolled and waited for rescuing B-29 crews near Mikura Island on 28 November 1944. Without rescue job, Archerfish began tracking and sank aircraft carrier Shinano by radar on 28 November 1944.
Former President George Herbert Walker Bush's TBF was shot down near Chichi Jima. He was picked by USS Finback. He was a student and volunteered for USN, when the Pacific War broke. While IJN Ro-105 rescued a Japanese air crew on 6 November 1943 near Bougainville of Solomons. I think this was few cases.
|Threat to battleships|
|IJN battleship Yamato and Musashi were afraid of US submarines. They could not run alone. Two or three destroyers always had to escort them, when they ran. Actually battle cruiser Kongo sank off Taiwan by a submarine for the first time in naval history on 21 November 1944. They had better stay still like Hitler ordered Kriegsmarine. Were German battleships afraid of RN submarines? German battleships actioned and ran without escort of destroyers.|
|Submarines built in 1945|
Nihon sensuikan shi
USN took I-400, I-401, I-14, I-201 and I-202 to Hawaii in January 1946. I think USN was interested because I-400, I-401 and I-14 carried 2 or 3 sea plane bombers. I-201 and I-202 ran faster submerged than surface.
|USN submarine torpedos do not adjust depth to run in the Pacific War. Why could USN torpedos control depth? IJN torpedos ran at the precision of 0.5 m depth. They fluctuated 10 or 15 times in the range of the precision while running 1,000 m. 1 atm is equivalent of 1 kgf/cm² and 10 m height of water. So pressure of 0.5 m is 0.05 kgf/cm². How didn't mechanical servo of USN torpedoes work well? Wikipedia explains that USN did a test using a light dummy head. Most submarine skippers simply set their torpedoes running depth to zero, risking a broach. By August 1942, the faulty running depth situation was in hand and submarines were getting more hits with the Mark 14.|
|TDC and Zigzag|
Japanese ships sailed zigzag to avoid torpedos of submarines in the Pacific war, when they was able to use such the way. But US fleet submarines had a TDC to track a target and gyroing. The TDC computed automatically. Otherwise IJN submarines used a primitive drawing table or board. Uboats used a simple mechanical computer compared to USN.|
Hirota p.249, Hashimoto p.372, Enright p.242-260
I-58 had to run zigzag near Yaku Island on the way to Okinawa Battle in the south of Kyushu on Apr 3rd 1945. Hashimoto p.292
|Submarines in the Pacific nowdays|
JMSDF, PLAN, South/North Korean, Russian and US submarines are in service in the north of the Pacific now, while US, IJN, Russian, RN, Dutch and Kriegsmarine submarines were in actionin the Pacific War. Japan worried oil ferry because of USN submarines in the Pacific War. The US subs were in duty far from Pearl Harbor or Free Mantle at first. PLAN or Korean subs can threaten Japanese oil reservers in Kagoshima from their ports easily.
 Hashimoto, p146
 Superfortress B-29, p223
 Shusenji no teikoku kantei, p224
 雷道上 no 問題
 Tokusyu senkoutei senshi(Ko-hyoteki)
 Mark 14 torpedo
 中国潜水艦、国旗掲げ浮上航行 鹿児島県 沖、海自が確認
 Yoshida Shigeru
 Ozawa Jisaburou
 NHK6, p98-99
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