the 1952 bermuda air crash occurred Presence on 6 december 1952 , when a douglas dc-4 , registered unk and operated by cubana de UNK , flying Motion from madrid to havana , crashed Catastrophe into the atlantic ocean following a refuelling stop at kindley air force base in bermuda .

it was a result of the 1750 treaty of madrid , which set a line of demarcation between spanish and portuguese colonial territory in south america .

although the vast majority of the events happened Presence in asturias and catalonia , strikes , clashes , and shootings happened also in the basque country , north of castile and UNK , cantabria , or madrid .

at the same time , general UNK fanjul , commander of the military garrison based in UNK barracks in madrid , was preparing GetReady to launch Process_start the military rebellion in the city .