The main character is a mad doctor who injects his patients with curare, a paralyzing poison. There are multiples scenes of operations on living subjects who are feeling the pain but unable to speak.
A man and a reanimated corpse struggle and kill each other.
A man threatens to leave a woman entombed in an underground mine.
A man struggles to crawl out of a mine, finally escaping but rolling down a hill. He is injected with curare and declared dead.
A doctor operates on a living man, cutting out his heart, which dies.