2014 Event Swedish officials release a photo of U-boat tracks along the sea floor as proof that a foreign submarine breached the nation�s waters; the search began after the military detected Russian-language distress calls and spotted an unidentified vessel 2014 Event Unidentified remains of victims of the September 11, 2001 terrorist attack are put to rest in a private depository next to the museum at the World Trade Center Memorial site; the remains will not be accessible or viewable to the public 2012 Event The Vietnamese government asks for help from the World Health Organization after an outbreak of an unidentified fatal disease occurs in Quang Ngai Province 1958 Event Unidentified soldiers killed in WW II and Korean War buried in Arlington 1949 Event Unidentified aircraft bomb Jerusalem
