Two British "U" Class Group 2 submarines, P-41 and P-66, were transferred to the Royal Norwegian Navy as UREDD and ULA respectively in 1941 and 1943. UREDD was lost in the North Sea off Norway on 24 February 1943 and ULA was scrapped in 1945.

One British "V" Class submarine, HMS VARIANCE, was transferred on completion in 1944 as UTSIRA, which served with the Royal Norwegian Navy until broken up in Germany in 1965. The exploits of both UREDD and ULA are told later.

When Mussolini stabbed France in the back, the Greek Navy had two battleships (both were sunk by German dive bombers off Salamis on 23 April 1941, just 17 days after Germany invaded Greece), two cruisers (one of which, HELLE, was torpedoed by the Italian submarine DELFINO off Tinos before Greece entered ,,he war), 11 destroyers, 13 torpedo boats, six submarines and about ,thirty auxiliaries such as depot ships, minelayers, mine sweepers etc. [n relation to its area, Greece has the longest coastline of any country in Europe not excepting even the fjord indented shores of Norway. The coastline of the mainland alone is deeply indented, and to it must be added the elaborate outline of the Morea, the weird shape of the peninsula of Khalkidike and the coastlines of the innumerable islands. To protect even the internal communications of Greece, the Greek Navy had to cover an area of eighty thousand square miles of the Aegean Sea as well as four hundred miles of deep indented coasts from Corfu to the end of Crete which directly faced the enemy.

The six Greek submarines were KATSONIS, PAPANICOLLS, GLAVKOS, NEREUS, PROTEUS and TRITON. All were launched between 1926 and 1928.

GLAVKOS was undergoing repairs at the time of the German invasion, in the base at Salamis. She made ready for sea with desperate haste and slipped out without trials on the long voyage to Alexandria. She reached there safely & was given further temporary repairs and then sent to Malta. The permanent repair work had hardly begun when the Luftwaffe fell on Malta in all the fury of the first attacks. Lt. Aslanoglou was killed when GLAVKOS received a direct hit and was sunk in Malta's Grand Harbour.

PROTEUS was rammed and sunk by the Italian torpedo boat ANTARES off Valona on 19 December 1940. KATSONIS was rammed and sunk by the German sub chaser UJ-2101 in the Aegean on 14 September 1932. TRITON was sunk by the German sub chaser UJ-2102 between Andos and Euboea on 16 November 1942. Both PAPANICOLIS and NEREUS were discarded after the war.

Two British "V" Class submarines, VELDT and VENGEFUL, were transferred to the Greek Navy in 1944 and 1945 respectively as PIPINAS and DELFIN. The captured Italian submarine PERLA, captured by the British corvette HMS HYACINTH and towed to Beirut in July 1942, recommissioned in the Royal Navy as P-712 was later transferred to the Greek Navy as MA TROZOS.

When the Axis forces invaded Yugoslavia in April 1941, that country had four submarines in her small fleet - HRABRl, NEBOJ.SA, SMELI and OSVETNIK. HRABRI, SMELI and OSVETNIK were captured by the Italians at Cattaro. The latter two were put into service as ANTONIO BAIAMONTI and FRANCESCO RISMONDO, while HRABRI was renumbered N-3 but was not commissioned due to her poor condition, and was later scrapped. NEBOJSA fled to Alexandria in April 1941 and operated together with the 2nd Submarine Flotilla in 1942 and with the 3rd Submarine Flotilla on 1943.