Our A model C-130's had wings that explosively detached. To my knowledge, nobody survived.
The wing separations were never intentional, and no explosive squibs were installed. It was the wing itself that exploded. And it was no safety feature.
A large prehistoric-looking red jeweled lense light cover was in the center of the panel, formerly attached to strain gauges used in certification of the aircraft. We affectionally referred to the light (which I never saw illuminated, by the way) as the "Wing-Off" light.