I obtained this for my book 15 Minutes and it is now declassified. Its is an analysis of a H-bomb accidentially ejected from a B-52 as it broke apart in the sky. Essentially, the bomb had no idea it was falling over North Carolina so it armed itself. It sensed it had been dropped (accelerometer), that is was falling (baro-gates) and so it started the timer and got the electrical charge ready to fire. The redacted parts are not terribly important. Zoom in and enjoy. Goldsboro, NC. One-half of one bomb remains in a farm field there.