Where did the white smoke come from?

we have a toyota supercustom model 1996. I was shocked to be told that it was emitting white dense exhaust smoke. I told the driver to park so that we can identify the reason for this. I only found a burst side wall on the engine block and another small hole on the opposite side of the engine block. What might have caused this?.

Lack of maintenance, worn engine, the fact that it was making a big racket BEFORE it blew up. Of course then there was the HUGE racket AFTER it blew up that someone behind you had to tell you about. Didn’t you notice the noise?