The I-401 hoisted a black flag of surrender in 26 August 1945, . Its unmanned planes were catapulted into the sea, all 20 Type 95 torpedoes were destroyed, and all codes, logs, charts and secret documents were also destroyed. Three days later, on 29 August 1945, the I-401 was picked up on USS Segundo's radar. I-401 surrendered to the American ship. Lieutenant Commander Nobukiyo Nambu delivered two samurai swords, as a symbol of surrender, to Lieutenant J.E. Balson.