And then, in this exciting and tense situation, there were these unexplained UFO events.'Ī roaring Arctic gale and high surf hindered some of Mainbrace's planned maneuvers, according to the Times. 'This was a training exercise, but it was also a flex of muscle. 'Tensions were already high,' O'Leary said.

'The whole point of Operation Mainbrace was to flex NATO's force and show the Russians that we would be prepared for a battle at sea,' David O'Leary, 'Project Blue Book' creator and executive producer, told Live Science. It was 'the largest and most powerful fleet that has cruised in the North Sea since World War I,' The New York Times reported on Sept. Dubbed Operation Mainbrace, the exercise brought together naval forces from nine countries, with most of the might represented by the navies of the United States and the United Kingdom.

In the fall of 1952, the North Atlantic Treaty Organization (NATO), an international military alliance, staged a 12-day exercise in waters near Norway and Denmark.

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