Tadmor Military Prison, Syria The only access to the facility is through an underground tunnel. One has to crawl to get in or out. There are laser beams deployed to ensure that the foolhardy that does try to escape will not succeed. Once inside, prisoners are tied up in heavy chains. Conditions are harsh and even inhumane, with prisoners getting beaten up regularly with metal rods. Executions also happen on a massive scale. The sad part is that not all the prisoners are actually criminals.