#Special cases

• Tectonically-locked
• Mostly Frozen
• Surface Water-free (Dune)
  • Or, no/very-little free water.
• All Water (Europa)
  • Currently, by question definition, this is non-habitable.

![Human limits] (http://i.livescience.com/images/i/000/049/907/i02/human-survival-limits-120809g-02.jpg?1344571431)

#Special cases

• Tectonically-locked
• Mostly Frozen
• Surface Water-free (Dune)
  • Or, no/very-little free water.
• All Water (Europa)
  • Currently, by question definition, this is non-habitable.

(Original source for this image: http://i.livescience.com/images/i/000/049/907/i02/human-survival-limits-120809g-02.jpg?1344571431)
![Human limits] (https://i.sstatic.net/OOqZu.jpg)