Sensory Deprivation and It's Effect on the Brain - Controversial Tests

This video shows some examples of sensory deprivation done on 6 volunteers in Guantanamo Bay, Cuba. Sensory deprivation is a process by which someone is deprived of normal external stimuli such as sight and sound for an extended period of time. They experimented on these people by taking them, isolating them and cutting their senses. This seems like a horrible experience and something very cruel. I think this shouldn't be done on a human being because it is not ethic. Before the first volunteers enter they do some tests. Then they are deprived for 48 hours. At the beginning some start to get a bit scared, and a man starts to speak alone. Then a second group of subjects were going to enter with harsher conditions. Before they enter they also do a language and a memory test. Some of them start to hallucinate. When they all come out the subjects repeat the tests and a reduction on suggestibility, verbal fluency, and other stuff is noticed. This happens becuase we need to have activity and stimulation.When they get out to nature again they are very happy. Again I repeat, I consider this a very harsh punishment even for people that have done bad things. I would never like to do something like that.