After a three-month journey by submarine, and a short stop in Singapore, he reached Tokyo on 11 May 1943, where he made a number of radio broadcasts to the Indian communities, exhorting them to join in the fight for India's Independence.
After a three-month journey by submarine, and a short stop in Singapore, he reached Tokyo on 11 May 1943. He remained in Tokyo meeting Japanese premier Tojo and the Japanese High Command, before arriving in Singapore in July 1943, where he made a number of radio broadcasts to Indians in South-East Asia exhorting them to join in the fight for India's independence.