from Great Game India:

Entering the van accompanied by armed soldiers, five surgeons, and nurses, Zheng Zhi stepped into a realm that would haunt him for the next twenty-five years.

At that time, Dr. Zheng was a resident physician at one of China’s largest military hospitals. His knowledge extended only as far as being part of a “secret military mission” near a military prison situated close to the northeastern Chinese city of Dalian.