[A] voluntary decision by France's National Center for Space Studies to dump more than 100,000 pages of witness testimony, photographs, film footage and audiotapes from its secret UFO archives onto its Internet site for worldwide viewing is an unprecedented move among Western countries. Most of them, the United States included, consider such records classified matters of national security. Within three hours of posting the first cases Thursday morning, the French space agency's Web server crashed, overwhelmed by the flood of viewers seeking the first glimpses of official government evidence on a subject long a target of both fascination and ridicule. The material dates as far back as 1954. Over the next several months, the space agency will post it to enhance scientific research seeking to explain what the French government calls "unexplained aerospace phenomena." One of the most detailed inquiries involved the report of an Air France crew flying near Paris on Jan. 28, 1994. Three crew members spotted a large reddish brown disk "whose form is constantly changing and which seems very big in size." As the passenger plane crossed its trajectory, the object "disappeared on the spot," the report said. Radar signatures confirmed an object of the same size and location described by the crew and led investigators to conclude that "the phenomenon is not explained to date and leaves the door open to all the assumptions."