Japan thought of their submarines as scouts. There role was mostly to locate, shadow, and attack Allied naval task forces.
During World War Two, the Japanese submarine fleet was cedited with sinking 184 merchant ships.
However, overall, the Japanese submarine fleet performed badly.
Japan started the war with 63 ocean-going submarines, and completed 111 during the war, for a total of 174.
128 were lost during the conflict.
Japan's huge boats were easy to sight visually and with radar.
They were slow to dive, hard to maneuver underwater, easy to track, and easy to hit.
Japanese hulls were weak.
Japanese submarines had no radar until the first sets were installed in June 1944.
Morale within the Japanese submarine force was very poor.
Japanese commanding officers could not disguise their embarrassment.
World War Two
BBC History of World War II
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