“In Event of Moon Disaster” is a speech (Page 1, Page 2) written by William Safire that President Nixon would have read if Apollo 11 moon landing astronauts were stranded on the moon. After making the speech, a clergyman was to commend their souls to “the deepest of the deep” and then close down communications with them.

What I find difficult to come to terms with is the shutdown of communications. These men have families back home who would have (hopefully) been given a chance to say a last goodbye to them. I can’t begin to imagine how difficult that would be for them.
Also found in the USA National Archives, a second memo (Page 1, Page 2) prepared by NASA provides suggested statement for the president and vice president in the event of Apollo “crew fatalities.”

Source: The Smoking Gun