“The submarine’s onslaught in angry seas.” I.J.N. Submarine Ro-33, c. 1935.

“The submarine’s onslaught in angry seas.” I.J.N. Submarine Ro-33, c. 1935.

“Ro-33 was an Imperial Japanese Navy Ro-33-class submarine. Completed and commissioned in November 1935, she served during World War II in the South China Sea, Indian Ocean, and southwestern Pacific Ocean and operated in support of Japanese forces in the invasion of British Malaya, the invasion of Java, the Battle of the Coral Sea, the Guadalcanal campaign, and the New Guinea campaign. She was sunk in August 1942 during her fifth war patrol.

“Ro-33 was laid down on 8 August 1933 by the Kure Naval Arsenal at Kure, Japan, as the lead submarine of the Ro-33-class. She was launched on 10 October 1934 and was named Ro-33 that day. She was completed and commissioned on 7 October 1935.

“On 1 September 1942, the Imperial Japanese Navy declared Ro-33 to be presumed lost off Port Moresby with her entire crew of 70. The Japanese struck her from the Navy list on 5 October 1942.”

– Wikipedia