[Laurent Rizzotti]

I remember reading that the percentage of dead bombs in WWII was between 5 and 20% depending of the period and air force.

So the bomb can be armed, but having failed to explode during the crash.

After all, regularly in Europe whole towns are evacuated because a bomb is found, sitting deep in the earth since WWII. And they sually were dropped by heavy bombers so fell from a higher height and probably faster than during a P-47 crash.

Best regards