6th Fleet (Imperial Japanese Navy)
Despite these advantages, IJN submarines achieved remarkably little during World War II primarily having in hindsight suffered from the antiquated strategy of the Imperial Japanese Navy General Staff, who viewed submarines as little more than scouts whose main role was to locate and shadow enemy naval task forces in preparation for a decisive surface conflict. Maybe the IJN General Staff was slow to change as the submarines were generally slow to dive, easy to track with radar and sonar, difficult to maneuver underwater, and less sturdy than their German U-boat counterparts.
Japanese submarine I-41
I-41 was a Japanese B2 type submarine. She was completed at Kure Navy Yard on 18 September 1943, whereupon she entered into service with the Imperial Japanese Navy Yokosuka Naval District, SubRon 11, and sailed to Yokosuka for final trials under the command of Lt. Commander Tamori Yoshimatsu. This was completed by 15 December 1943 and command was transferred to Lt. Commander Itakura Mitsuma. "I-41" was reassigned to the Sixth Fleet in SubRon 1's Sub Division 15.