Type 3 submergence transport vehicle
![](/Images/godic/202501/26/IJA_Yu1-19434015.jpg")
![Yu 3 docking to USS Rushmore (1945)](/Images/godic/202501/26/IJA_Yu3-19454015.jpg")
![Yu 1001 class at Tateyama (1945)](/Images/godic/202501/26/MaruYu-19454015.jpg")
![Yu 2001 trial-run in Tōkyō Bay (1944)](/Images/godic/202501/26/IJA_Yu2001-19444015.jpg")
The Type 3 submergence transport vehicle(三式潜航輸送艇San-Shiki Senkō Yusōtei) was a class of transport submarines built for the Imperial Japanese Army (IJA) during the Second World War. The IJA planned to build over 400 boats, however only 38 boats were completed until the end of war. The IJA called them Maru Yu(マルゆ).