In a 1973 article in "Spaceflight", a magazine published by the British Interplanetary Society (BIS), he said he had identified and deciphered a hidden radio message sent by an alien space probe that had been caught but overlooked in the late 1920s by a collaboration of Norwegian and Dutch researchers who were studying the long delayed echo effect. Published along with an accompanying editorial disclaimer, Lunan maintained that the putative message came from an object at the L5 point in the same orbit as the Moon, sent by the inhabitants of a planet orbiting Epsilon Boötis.