As they were building the road, they inadvertantly broke through the soil to a cave below. It seems that some underground Christians had been literally living underground, and now they were caught.
The NK government decided they were guilty of being Christians and it was a capital offense. So they had these brave Christians lie down in the road and a steam-roller rolled over them, feet first. As they died this painful death, they were singing, "Move Love to Thee" to Jesus.
That's faith with works.
I'm more of a "praise the Lord, and pass the ammunition" kind of Christian, myself....