Vault 10 was an experiment from the Enclave were all you can drink there is Nuka cola. Dinking Nuka cola caused most vault dwellers to be obesed and addicted to Nuka cola and junk food. Twig from the popular fan made web series Nuka break is a vault dweller from vault 10 and was teased for being the most skinny citizen that lives in vault 10. Vault 10 is not mentioned in any of the Fallout games but it is most likely to be some were in the Mojave desert. That's all i really know about vault 10 but hopefully in the next Nuka break episode thay will give us more information about vault 10 and maybe someday I will be able to make a wiki about vault 10.