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Worldbuilding

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  • $\begingroup$ And as a bonus, you get the reverse-helium effect in that it makes everyone's voices super-deep. $\endgroup$
    – Darrel Hoffman
    Commented Sep 12, 2019 at 19:14
  • $\begingroup$ Ah, you beat me to it. In addition to its mostly inert nature, and voice changing characteristics, SF6 can cause irritation of the lungs and throat, as well as pulmanory edemas if you breath too much of it. In an SF6-laden atmosphere, the rescuers would operate under a ticking clock on their time to complete the rescue. $\endgroup$
    – asgallant
    Commented Sep 12, 2019 at 19:20
  • $\begingroup$ @asgallant Out of interest, how much would be too much SF6? What concentrations can breath indefinitely? $\endgroup$
    – TheDyingOfLight
    Commented Sep 12, 2019 at 20:30
  • $\begingroup$ @TheDyingOfLight wish I could say, but my knowledge of SF6 comes from watching Periodic Videos and skimming wikipedia. $\endgroup$
    – asgallant
    Commented Sep 12, 2019 at 20:44
  • 2
    $\begingroup$ "probably a sign that the planet is a terraformed low gravity planet" <== is potentially a really interesting bonus feature / side plot / sequel hook! (Who were the Ancient Aliens who made this world...?) $\endgroup$
    – dgould
    Commented Sep 12, 2019 at 23:42