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Oldcrow, those tonnages seem ambitious. Just reading from the Graphs , and not including "naval" I count well over 10m tons of japanese shipping sunk. they never had 10 million tons of shipping to sink
I dont thjink that is correct, concerning allied losses. according to HMSO returns, the losses to allied controlled shipping 1939-45, by year were (in 000's tons):
1939: 755
1940: 3992
1941: 4329
1942; 7997
1943: 2002 (Jan to May)
1943: 1219 (Jul to dec)
1944: 515 (Jan to May)
1944: 531 (Jun to Dec)
1945: 439 (to august)
685 or 14.5 million tons were due to enemy submarines, (with close to 2 million tons sunk by japanese submarines in the pacific and Indian oceans), followed, in descending order, by a/c, mines, warship, merchant raider, eboats, and accident.
May I ask which book? I only have "The Japanese Submarine Force and World War II" by Boyd and Yoshida. I once borrowed a copy of "Submarines of the Imperial Japanese Navy" by Carpenter Polmar, which might be the best on designs and specifications. I have never read "Sunk: The Story of the Japanese Submarine Fleet, 1941-1945" by Hashimoto and Beach.Ive got an excellent book on the operations by IJN subs. ..snip....
They even had an ability to search better when surfaced by raising their periscope high above the sail (is that name anachronistic?).