The test subjects were political prisoners deemed enemies of the state during world war II.
Everything was fine for the first 5 days, the subjects hardly complained having been promised (falsely) that they would be freed if they submitted to the test and did not sleep for 30 days. Their conversations and activities were monitored and it was noted that they continued to talk about increasingly traumatic incidents in their past, and the general tone of their conversations took on a darker aspect after the 4 day mark.
After five days they started to complain about the circumstances and events that lead them to where they were and started to demonstrate severe paranoia. They stopped talking to each other and began alternately whispering to the microphones and one way mirrored portholes. Oddly they all seemed to think they could win the trust of the experimenters by turning over their comrades, the other subjects in captivity with them. At first the researchers suspected this was an effect of the gas itself...
After nine days the first of them started screaming. He ran the length of the chamber repeatedly yelling at the top of his lungs for 3 hours straight, he continued attempting to scream but was only able to produce occasional squeaks. The researchers postulated that he had physically torn his vocal cords. The most surprising thing about this behavior is how the other captives reacted to it... or rather didn't react to it. They continued whispering to the microphones until the second of the captives started to scream. The 2 non screaming captives took the books apart, smeared page after page with their own feces and pasted them calmly over the glass portholes. The screaming promptly stopped.
So did the whispering to the microphones.
After 3 more days passed. The researchers checked the microphones hourly to make sure they were working, since they thought it impossible that no sound could be coming with 5 people inside. The oxygen consumption in the chamber indicated that all 5 must still be alive. In fact it was the amount of oxygen 5 people would consume at a very heavy level of strenuous exercise. On the morning of the 14th day the researchers did something they said they would not do to get a reaction from the captives, they used the intercom inside the chamber, hoping to provoke any response from the captives they were afraid were either dead or vegetables.
They announced: "We are opening the chamber to test the microphones step away from the doors and lie flat on the floor or you will be shot. Compliance will earn one of you your immediate freedom."
To their surprise they heard a single phrase in a calm voice response: "We no longer want to be freed."
Debate broke out among the researchers and the military forces funding the research. Unable to provoke any more response using the intercom it was finally decided to open the chamber at midnight on the fifteenth day.
The chamber was flushed of the stimulant gas and filled with fresh air and immediately voices from the microphones began to object. 3 different voices began begging, as if pleading for the life of loved ones to turn the gas back on. The chamber was opened and soldiers sent in to retrieve the test subjects. They began to scream louder than ever, and so did the soldiers when they saw what was inside. Four of the five subjects were still alive, although no one could rightly call the state that any of them in 'life.'
The food rations past day 5 had not been so much as touched. There were chunks of meat from the dead test subject's thighs and chest stuffed into the drain in the center of the chamber, blocking the drain and allowing 4 inches of water to accumulate on the floor. Precisely how much of the water on the floor was actually blood was never determined. All four 'surviving' test subjects also had large portions of muscle and skin torn away from their bodies. The destruction of flesh and exposed bone on their finger tips indicated that the wounds were inflicted by hand, not with teeth as the researchers initially thought. Closer examination of the position and angles of the wounds indicated that most if not all of them were self-inflicted.
The abdominal organs below the ribcage of all four test subjects had been removed. While the heart, lungs and diaphragm remained in place, the skin and most of the muscles attached to the ribs had been ripped off, exposing the lungs through the ribcage. All the blood vessels and organs remained intact, they had just been taken out and laid on the floor, fanning out around the eviscerated but still living bodies of the subjects. The digestive tract of all four could be seen to be working, digesting food. It quickly became apparent that what they were digesting was their own flesh that they had ripped off and eaten over the course of days.
Most of the soldiers were Russian special operatives at the facility, but still many refused to return to the chamber to remove the test subjects. They continued to scream to be left in the chamber and alternately begged and demanded that the gas be turned back on, lest they fall asleep...
To everyone's surprise the test subjects put up a fierce fight in the process of being removed from the chamber. One of the Russian soldiers died from having his throat ripped out, another was gravely injured by having his testicles ripped off and an artery in his leg severed by one of the subject's teeth. Another 5 of the soldiers lost their lives if you count ones that committed suicide in the weeks following the incident.