During the September Campaign he took part to Battle of Hel. On 14 September he arrived to Riga on the fishing boat "Albators". After a short stay in the internment camp he escaped by plane to Sweden and from there via Norway to Aberdeen, where he arrived on 31 December 1939. From 15 January 1940 he served on the submarine . In September 1941 he was transferred to the ORP Sokół. On 18 August 1942 he was named commander of his vessel and took part to the operations in the Mediterranean. His ship was attached to the 10th Submarine Flotilla based at Malta. On 12 September 1943 "Sokół" was the first allied vessel to enter the port of Brindisi receiving the surrender of the local authorities. On 7 October he sank a German troopship "Eridania" (7094 tons), the largest ship sunk by the Polish Navy. After returning to the United Kingdom in late March 1944 and a renovation "Sokół" patrolled the coast of Norway. On 12 December 1944 he became the Deputy head at the Navy specialists training Centre (Centrum Wyszkolenia Specjalistów Floty).