HAL: Well, certainly no one could have been unaware of the very strange stories floating around before we left. Rumors about something being dug up on the moon. I never gave these stories much credence. But particularly in view of some of the other things that have happened, I find them difficult to put out of my mind. For instance, the way all our preparations were kept under such tight security, and the melodramatic touch of putting Drs. Hunter, Kimball, and Kaminsky aboard, already in hibernation after four months of separate training on their own.

Quote