清川江
In April 1951, a crashed MiG-15 was spotted near the Chongchon River. On 17 April 1951, a USAF Sikorsky H-19 staging through Baengnyeongdo carried a US/South Korean team to the crash site. They photographed the wreck and removed the turbine blades, combustion chamber, exhaust pipe and horizontal stabilizer. The overloaded helicopter then flew the team and samples back to Paengyong-do, where they were transferred to an SA-16 and flown south and then to Wright-Patterson Air Force Base, Ohio, for evaluation.