Actually in the movie there was an underground (double entendres not intentional) operation in the hospital which targeted young vital people undergoing simple operations. The operating room was rigged where the oxygen tanks were replaced by carbon monoxide (i think ) the anesthesiologist would see nothing wrong until he had to bring them out of the effects of the anesthesia. They all ended up in a coma. The bodies were all housed in a separate complex that was designed to take "care of them". Starred George C. Scott (as the hospital administrator) and Genevieve Bujold a french actress who played his girlfriend and the doctor who uncovered the plot. it was a good movie.