A Suppressed KBS TV Scoop ROK and US authorities did their best to hide the fact that a US submarine sank at about the same time as the Cheonan. The ROK authorities did not announce the sinking of the US submarine, nor did they call Warrant Officer Hans death an accident which occurred while searching inside a US submarine. Instead, they announced that he died while searching for Cheonan survivors bodies. Warrant Officer Han was honored as a national hero. KBS, which reported on the existence of the third buoy, was criticized for filing a false report. Thereafter, the possibility that the Cheonan was attacked by an American submarine was regarded as a dangerous and groundless rumor, and was virtually suppressed in South Korea. However, the suspicion that the Cheonan sank as a result of friendly fire surfaced within the South Korean media immediately after the event. On the day of the incident, ROK and US forces were conducting the joint military exercise Foal Eagle to the south of Byaengnyeong Island." .