 Three days later, on 21 April, the boat made her rendezvous with the , just east of Madagascar in the Indian Ocean, Subhash Chandra bose and Abid Hassan boarded I-29 and two Japanese Navy officers, both shipbuilding officers, Captains Emi Tetsushiro and Tomonaga Hideo, who were to study U-boat building techniques upon their arrival in Germany boarded U-180.Bose and Hasan's transfer is the only known record of a civilian transfer between two submarines of two different navies in World War II.Also received were two tonnes of gold ingots as payment from Japan for weapons technology.