I ' ve been told niggas on here that shit ain ' t safe . read my review . If you like blacking out and full on benadryl hallucinating than go ahead <| sep |> honestly it ' s surprisingly good , sock portion is a weird texture but other then that pretty solid <| sep |> In theory , maybe , in practice unlikely . The biggest problem with even the smallest most efficient community surviving underground is that they need oxygen and food . Without sunlight they ' re not getting those things because of a lack of photosynthetic organisms providing those things on their own . There could be some sufficiently complex technology to work around this problem like nuclear or geothermal power sources providing the energy needed to recycle oxygen . And you could have kemosynthetic organisms provide food , again in theory , but in practice there ' s no organism like that now that could provide for whole communities . You mention having a portion of land on the surface for them to use then yes , this makes an otherwise underground community much more likely and increases their odds for survival . Also as you mentioned having a population with enough genetic diversity to survive is important . But it ' s not just humans you ' d have to worry about in that case . Any food supplies , if this is entirely underground or not , would have to be genetically diverse too or you get situations like what ' s happening to bananas in the real world , a single infection could potentially wipe out whole crops .