[1985 [1984], Dick van der Aart, “Electronic Spies for the Fleet”, in Sidney Woods, transl., Aerial Espionage: Secret Intelligence Flights by East and West[1], ARCO/Prentice Hall Press, →ISBN, →LCCN, →OCLC, page 60, column 2:
Near the North Korean coast, close to the Musu-dan Peninsula, the crew switched on the highly sensitive electronic intelligence installation, which weighed 2,700 lbs (6,000 kg).]
The January temperatures range from -20.0°C at the most isolated spot, Changjin (950 ft), to -16.7°C at Pung son, (1.150 ft), actually slightly higher in elevation but closer to the coast, to -7.6°C at Kolchu (127 ft), on the plain but not on the coast, to -4.6°C at Musu Point (76 ft), a lighthouse on the coast.
2009, Jack L. Wells, chapter 19, in Paper Dragon, Wooden Ship[3], Infinity Publishing, published 2013, →ISBN, →OCLC, page 135:
Deep Sea 129's assigned task was a routine “Beggar Shadow” signal intelligence (SIGINT) collection mission. Its flight profile northwest over the Sea of Japan took it to an area offshore of Musu Point, where the EC-121M would turn northeast toward the Soviet Union and orbit along a 120 nautical mile long elliptical track.
