Inland Sea off Hikari. On 20 March 1945 she conducted combat exercises in the Seto Inland Sea with the submarines I-36, , I-53, I-56, and I-58. On 27 March 1945, I-47 was selected to lead the Tatara Kaiten Group in an attack on American ships off Okinawa. After loading provisions for two months and 20 torpedoes at Kure, she departed on the morning of 28 March 1945 and moved to Hikari, where she embarked six kaitens. She conducted diving tests with the six kaitens aboard on 29 March 1945, then returned to Hikari and embarked the kaiten pilots. Third kaiten mission I-47 got underway from Hikari on the afternoon of 29 March 1945, heading through the Bungo Strait on the surface at under the escort of the submarine chaser . About two hours after she rendezvoused with CHA-200, American carrier aircraft attacked the two ships in the Sea of Hyūga off Kyushu at around 16:00, forcing I-47 to crash-dive and sinking CHA-200. I-47 surfaced after dark, but two American aircraft illuminated the area with flares and attacked her with several depth charges. She survived the attack with only minor damage. While I-47 was on the surface recharging her batteries south of Kyushu east of Tanegashima at 02:30 on 30 March, she sighted two Allied patrol vessels directly ahead of her and crash-dived. A main ballast tank vent malfunctioned, and she assumed a 50-degree down angle, reaching a depth of before her crew could stop her descent. Her crew finally stabilized her at a depth of . Allied vessels pursued her for the next 11 hours, during which one of her periscopes and one of her fuel tanks developed leaks and her internal temperature rose to . After finally breaking contact, I-47 surfaced south of Tanegashima and headed south, but two Allied patrol aircraft sighted her and attacked her, dropping 20 depth charges. I-47 submerged and escaped with only minor additional damage, but her crew found it impossible to stop the leak in her fuel tank. She entered Uchinoura Bay on the coast of Kyushu before daybreak on 31 March 1945 so that her crew could inspect her damage. Her crew found an unexploded depth charge on her bridge and damage to her outer hull above her ballast tanks and to her anti-sonar coating. After reporting the damage to 6th Fleet Headquarters she received orders to abandon her mission and return