This future Medal of Honor recipient started a spy ring while held in a North Vietnamese prison

We Are The Mighty via US Air Force Two sonic booms told the American prisoners in Vietnam’s infamous Hoa Lo prison – the Hanoi Hilton – their escape plan was a ‘go.’ On May 2 and 4, 1972, two SR-71 Blackbirds overflew Hanoi, North Vietnam at noon. The first plane broke the sound barrier, causing an ear-splitting sonic boom over the city. Fifteen seconds later, the other Blackbird did the same thing. It was the start of Operation Thunderhead, an ambitious plan to help POWs to escape f...