[shadowgovt]

Collins also spent a lot of time outside of radio comms.

If something had gone wrong on the dark side of the moon, we might never have known what happened. We'd have had a perfectly cheerful conversation with the command module pilot, then a comms blackout, then nothing... With a lot of coordination, the lander crew could possibly have returned to the command module without Collins's support to find out what happened to him (and hopefully found a CM still in a condition to go home).

And for all that, he reported in his autobiography that it didn't bother him.

[7952]

It seems to me that astronauts are selected precisely because they are not bothered by that kind of existential worry and fear. If something is wrong they work the problem and perhaps die trying.

[hbrav]

For the benefit of anyone who hasn't read it, his autobiography is called Carrying The Fire, and is excellent.