Fortunately for a USAF crew the detonation yield was somewhat less than the Soviets planned; a KC-135 had been modified under the Big Safari programme to obtain

Fortunately for a USAF crew the detonation yield was somewhat less than the Soviets planned; a KC-135 had been modified under the Big Safari programme to obtain intel, but strayed so close that the airframe suffered scorching! One fortunate crew counted their blessings that day...