Yea! You got it Alan....a subtle explosion, we call them 'controlled explosions' over here. Saw some news footage of one in Iraq. On detonation, the car shook, dust and sand flew off its horizontal surfaces, no fire, no flames, no big bang, just a dull thud then some wispy smoke......well little bit more than wispy actually. Been right thro the PI libraries. Anything like this possible?