About the Swedish DC-3.
It was finally found 2003 and recovered from the water spring 2004. Big stuff locally. The 1952 shoot down of the DC-3 was a defining event for swedens attitude towards Soviet. Not that many had hankering for communism before ...
It did carry american equipment and was gathering SIGINT on USSR radar stations with intent to share info with the americans. No civilians on board.
The swedish government states it was cruising north - south on neutral waters.
The wreck being recovered east of 'Gotska Sandцn' supports the swedish government on that point (they did deny for decades it was an intelligence mission claiming instead it was a 'training' mission).
It went down rapidly after getting attacked (reported home on radio, no survivors) so it didn't have time to get far before splashing.
Here's a map:
http://www.lib.utexas.edu/maps/commonwealth/balticstates.jpg'Gotska Sandon' is the little island due north of Gotland.
And btw russkies, thank you very much for shooting down the rescue Catalina as well.
I'm no expert on these matters but I doubt very much sweden would have sent a plane into USSR air space, they simply feared the Soviet Union to much to make unneccesary provocations.