In June 1947, days before Kenneth Arnold's flight, a harbour patrolman named Harold Dahl claimed that six doughnut-shaped objects over this island in Puget Sound had dropped a mass of hot slag, killing his dog and injuring his son. He also described a man in black who advised him to say nothing. Arnold was hired to investigate; two Air Force officers collected samples of the slag and died when their bomber crashed on the way back. The story acquired a reputation as the first dark one in the subject. A few weeks later Dahl and his partner admitted to the FBI that they had invented the whole thing to sell a magazine article, and that the slag was ordinary smelter waste. The confession is far less well known than the story.

Read next

Trans-en-Provence and the Mark on the Terrace

On 8 January 1981 a retired man named Renato Nicolaï was working in his garden outside this Provençal town when he heard a whistle. Turning, he saw a lead-grey object the size of a car settle onto the lower terrace; a few seconds later it lifted and went. The gendarmerie came the next day and took soil and plant samples — a rare case where samples were taken before any publicity. GEPAN, the state laboratory at the French space agency, found compressed soil, traces of heating, and biochemical changes in the alfalfa: plants at the centre of the mark had between a third and a half less chlorophyll. The GEPAN report is published. It does not name a cause.