 On September 15, 1952, a South Korean scientific expedition aboard Chinnam-ho and a fishing crew of 23 aboard Kwangyong-ho were attacked on Liancourt Rocks waters by a mono-propellered aircraft bearing the US insignia that disappeared in the direction of Japan after dropping four bombs.The Republic of Korea Navy had initially submitted an itinerary to the United Nations Naval Commander in Busan (CTG 95.7) on Sep 7 of the expedition to visit Ulleungdo Island and Liancourt Rocks September 14 and 15.Granted approval to travel to said areas by CTG 95.7, the expedition departed Busan on Sep 12 unaware of the United States-Japan Joint Committee's bombing plan over Liancourt Rocks for Sept 15.