Originally Posted by
sktarq
As to the above mutations. In a world with limited breeding partners deep under the sea by a group of people who are survivors from the age of eugenics who were driven to this state via Cthulu and/or similar horrors I don't see such mutants surviving very long. Certainly not being allowed to breed. Which coud lead to all sorts of issues-basement dwelling mutants. Mutants as forced labor for semi suicidal missions etc.
As for health issues. Vit D can be made in the lab quite easily. Though access to such lab made vitimins could be a plot device-status mark etc. Think vit-D fortified milk.