Several years ago, there is a huge explosion on Mekong River. Apparently during the Vietnam war a huge bomb (from airplane) was buried on the ground. Because of recent flood and mudslides, the bomb was thrown into the river, hit a rock and exploded.
US had lost one of its nuclear bombs on a swamp in Georgia:
"What is not in dispute is that on the night of February 4-5, 1958, a B47 bomber set out from Homestead Air Force Base in Florida with a Mark 15 Mod 0 on board. This was one of America’s earliest thermonuclear bombs, containing 400lb of conventional explosives and uranium. The 7,600lb weapon was designed with a removable nuclear capsule, or plutonium trigger. Off the Savannah River, an intensive search took place using ships with divers and underwater demolition teams. Local newspapers reported that the Air Force was anxious to recover the “portion” of the weapon it had admitted losing, for security reasons and because it was an “expensive part”. But after three square miles had been examined over more than two months, the search was called off and the bomb was officially declared “irretrievably lost”"
Is it possible that the loud explosion in Finland is from old WW II/coldwar bombs or failed/lost USSR missiles?