Unit 731: Inside Japan’s WWII Human Experiment Lab
Unit 731 looked like a military research base. In reality, it was one of history’s most secretive human‑experiment labs. Japanese doctors infected prisoners with plague, froze limbs solid, and tested biological weapons on entire villages. This guide explains what Unit 731 was, how many people died, how the U.S. covered it up—and why its legacy still haunts debates on biological weapons and medical ethics.