Field Marshal Jan Smuts, prime minister of South Africa, broadcast a speech on the BBC on 29 September 1946. He talked about the prospects for peace in the post-war world, a subject on which he could claim some authority, since he had helped unify Anglophones and Afrikaners after the Boer War, and was involved in the Paris peace conferences after both world wars. The speech was mainly about the United Nations (or as he quaintly called it, 'Uno') and the growing signs of friction between the former Allies on the Security Council. And we all know how that turned out. (Churchill had given his 'Iron Curtain' speech in March.) But one section is somewhat confusing for modern readers:
The United States may not long continue to enjoy the sole secret of the atom bomb, and this and other no less deadly weapons will at no distant date be in the possession of other nations also. The flying bombs, now seen nightly in the west, are indications of what is going on behind the curtain. It is highly doubtful whether any new weapons, or indeed any mechanical inventions, could ever be relied on to remove the danger of war. A peaceful world order could only be safely based on a new spirit and outlook widely spread and actively practised among the nations.1
Flying bombs seen nightly in the west? What flying bombs?
Smuts was referring to reports which had been coming out of Sweden since May, and more recently from Denmark and Greece. Fast moving objects, sometimes with wings, sometimes without, were seen flashing across the sky. Some had flames shooting out the rear; others appeared to manoeuvre. Some of them crashed; residents of Malmö reported that windows were broken when a rocket 'exploded' over their town.2 They were sometimes even tracked on radar. A photo was even taken of one. They were seen by military personnel as well as by ordinary people. An example:
One of the mysterious bombs which in recent weeks have been passing across Sweden was seen last night by an officer of the Air Defence Department of the Defence Staff. He reports that the bomb looked like a fireball with a clear yellow flame passing at an estimated height of between 1,500 and 3,000 feet and at a considerable but quite measurable speed.3
The term now given to these objects is ghost rockets.
Suspicions immediately fell on the Russians, who had taken possession of the German missile research station at Peenemünde, along with many of its scientists and equipment. This was where V-1 and V-2 development had taken place during the war. As the Manchester Guardian editorialised:
No one has said who starts them [the ghost rockets] on their journey, but it does not need much imagination to see Russian engineers, no doubt assisted by obedient German scientists, operating from a research station on the Baltic coast. Russia, of course, could have found a more secret practice range, but she probably enjoys revealing a little of her plaything, just as America carefully lets us know at least enough about her bomb to hold it in respect.4
There was even a precedent: the Germans had test-fired many V-1s and V-2s over the Baltic, and one of the latter landed on Swedish territory. The resultant wreckage was of some use to Allied scientific intelligence in working out just how much of a threat the new rocket weapon would be. But as R. V. Jones, who was involved in both the wartime and (more peripherally) the ghost rocket investigations, pointed out, with hundreds of sightings being reported from Sweden, some proportion of the supposed rockets would have crashed and the wreckage discovered. The Swedish military did look, even searching the bottom of a lake which a winged missile had crashed into. Nothing was found (although in Most Secret War, Jones relates an amusing episode about one fragment which initially denied analysis, but which turned out to be a lump of coke).5
As with the phantom airship scares a generation earlier, parallels can be found nearby in time and/or space. As I noted above, ghost rockets were also reported from Denmark and Greece. Both of these countries were fairly close to the new Iron Curtain, so it wasn't too implausible to think that they too might be playing unwitting hosts to Soviet weapon tests. But then ghost rockets were also seen in Portugal, Belgium and Italy -- except for the last, much farther away from the Soviet sphere. Some of the ghost rockets were undoubtedly meteors (the Perseid meteor shower coincided with the August peak of sightings; the photo mentioned above looks a lot like a meteor to me), others may have been new and unfamiliar jet aeroplanes (Sweden received its first Vampires in June). The British Consul at Salonika thought what he saw was nothing more than a Very light.6 But, as usual, not everything can be explained this way.
Going backwards in time, to the early 1930s, so-called 'ghost flyers' were seen, often in snowstorms, in the northern parts of Sweden, Norway and Finland. These aircraft were seen (and heard) mainly at night, sometimes flying at low-level. But they carried no markings, and military searches found neither the ghost fliers nor the aerodrome they presumably operated from. Explanations at the time included Soviet or Japanese (!) spies, alcohol smugglers or misperception and mass delusion. Soviet or even combined Soviet-German exercises are perhaps the most likely explanation, though no archival smoking gun has been found.
And going forward a few decades, and into a different medium altogether, in the 1980s and early 1990s Swedish coastal waters were plagued by incursions from mystery submarines. This time the witnesses were Swedish naval personnel, and the submarines were detected with sonar. Again, the chief suspect was the Soviet Union (though NATO has been blamed more recently), and after the 'Whiskey on the rocks' incident of 1981, when a Soviet diesel sub ran aground near a major Swedish naval base, that's understandable. But even trained sonar operators make mistakes: one prominent incident in 1982 was, it seems, caused by a charter boat.
So, to generalise wildly about a country I know not a lot about, the Swedish ghost rockets, ghost flyers and mystery submarines sound like the paranoia of a small country stuck in between hostile blocs and trying to stay neutral. Technology made it easier for foreign powers to sneak in and spy on Swedes. Although the geopolitical context was different, this sounds a lot like the situation in Britain in 1909 and 1913. The enemy outside became the enemy within.
Back to Smuts. He didn't place much emphasis on the ghost rockets; they were just further evidence of what everyone already knew, that new weapons were changing the world (yet again), and that the world needed to change its ways in consequence. He didn't have any very compelling answers to this problem -- maybe a world government proper, one day; for the moment, he wanted the great powers to have full and frank discussions about what they really wanted from each other, rather than issuing spurious vetoes -- but that he felt he had to try was just as much a sign of the times as the ghost rockets themselves.