 The rocket with the 1.45-megaton Starfish device (W49 warhead and the MK-4 Re-entry vehicle) on its nose was launched that evening, but the Thor missile engine cut out only 59 seconds after launch.The range safety officer sent a destruct signal 65 seconds after launch, and the missile was destroyed at approximately altitude.The warhead high explosive detonated in 1-point safe fashion, destroying the warhead without producing nuclear yield.