Japanese submarine Ro-110

The Ro-100 class was a medium-sized, coastal submarine derived from the preceding Kaichū type. They displaced surfaced and submerged. The submarines were long, had a beam of and a draft of . They had a double hull and a diving depth of . For surface running, the boats were powered by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, the Ro-100s had a range of at ; submerged, they had a range of at . The boats were armed with four internal bow torpedo tubes and carried a total of eight torpedoes. They were also armed with two single mounts for Type 96 anti-aircraft guns or a single 8 cm/40 3rd Year Type naval gun| L/40 AA gun. ==Construction and commissioning==

Ro-110 was laid down as Submarine No. 401 on 20 August 1942 by the Kawasaki at Kobe, Japan. She had been renamed Ro-110 by the time she was launched on 26 January 1943. She was completed and commissioned on 6 July 1943. ==Service history==

July–November 1943 Upon commissioning, Ro-110 was attached to the Sasebo Naval District. on the day Ro-110 attacked the convoy, a submarine torpedoed the British 4,807-gross register ton armed merchant ship Daisy Moller off India's coast in the Eastern Ghats region. Daisy Moller, which had left Bombay, India, on 27 November 1943 with a cargo of war materials including ammunition, had made a brief stop at Colombo, Ceylon, before getting back underway on 8 December to complete her voyage by steaming independently to Chittagong, India. After Daisy Moller′s crew abandoned ship in three lifeboats and a number of life rafts and she sank in the Indian Ocean at , the submarine surfaced and rammed the lifeboats, smashing them and spilling their occupants into the sea. The submarine's crew then machine-gunned the survivors in the water Sources disagree on the number of casualties. Other sources claim her crew totaled as many as 127 and that only 14 survived. Ro-110 attacked Convoy JC-36 — which was bound from Colombo, Ceylon, to Calcutta, India — in the Bay of Bengal northeast of Madras. She scored two torpedo hits on the British 6,274-gross register ton merchant ship Asphalion. The torpedoes left six members of Asphalion′s crew missing and ten injured and flooded her No. 3 hold and engine room, crippling her. Her surviving crew abandoned ship at , but she remained afloat and later was towed to port. Meanwhile, the convoy's escorts counterattacked. The Royal Indian Navy sloop and the Royal Australian Navy corvettes and gained sonar contact on Ro-110 and attacked her with depth charges. Their crews subsequently observed a large amount of oil rising to the surface and heard several large underwater explosions, marking the sinking of Ro-110 at . On 15 March 1944, the Imperial Japanese Navy declared Ro-110 to be presumed lost with all 47 men on board. The Japanese struck her from the Navy list on 30 April 1944. ==Notes==