Q. Witness, were any political prisoners used in these high-altitude experiments? A. Yes, there were political prisoners who were used in these experiments. All foreigners were considered political prisoners. Q. Witness, tell the Tribunal how one could tell the difference between a political and a criminal prisoner in a concentration camp? A. All inmates had certain squares with letters; the political inmates had red squares; the German political inmates had a plain red square; the Poles had a red square with a “P” marked on it; the Russians with an “R”; all nationalities could be identified by the first letter of their country. The red square with a yellow star was the Jew. The green square, on the other hand was the sign of the so-called professional criminal. Here it must be said that there were quite a number of people with green squares who did not fall under the classification of professional criminals, but who were sent to the camp with that square since the Gestapo could find no excuse to send them into the camp as political prisoners. Q. Now, was this square really a square or a triangle? A. It was really a triangle with the head of the triangle pointed down to the earth. If it pointed upward, it indicated a member of the Wehrmacht who was sent to the camp for punishment. * * * * * Q. Witness, were any Jews experimented on in these high-altitude experiments? A. Yes. Q. Now, tell the Tribunal approximately how many prisoners were killed during the course of the high-altitude experiments? A. During the high-altitude experiments 70 to 80 persons were killed. Q. Did they experiment on prisoners other than those condemned to death? A. Yes. Q. Were any of those prisoners who had not been condemned to death killed during the course of the high-altitude experiments? A. Yes. Q. Do you have any idea how many may have been killed? A. There could have been approximately 40 persons. Q. That is, 40 persons were killed, who had not been condemned to death, out of a total of 70, did you say? A. Yes. Q. Now, were some of those killed political prisoners? A. Yes. Q. Is there any way of telling whether or not a prisoner had been condemned to death—that is, when the experimental subject arrived in the pressure chamber, was there any way to know whether he had been condemned to death? A. Once the experimental subjects came from the Bunker, that is, if the SS brought them out, we could always tell they were prisoners who had been condemned to death. When the inmates were sent by the camp leader, and were brought there by him, then we could also tell they were persons who came from the camp, and that they were not persons who had been condemned to death. Q. Could Romberg know this just as you did? A. He could only know it if he tried to find out about it, because he could hardly differentiate whether the person concerned came from the Bunker or came from the camps.