I have an idea for a society of humans who have a level of technology similar to that of the [North Sentinelese Islanders](https://en.wikipedia.org/wiki/Sentinelese): borderline stone age with maybe some ability to use metal. The population can be anywhere between 100 to 200 people. They mostly live in a cave system, getting all of their food from the caves and living there for most of their lives. Some people might leave the cave to forage, but they will rather travel farther than five miles from the cave & usually only leave the cave for about 10 hours a week maximum before returning. They usually forage at night because their night vision makes them sensitive to daylight. Would such a civilization be possible or feasible? Could the people be able to feed of the flora and fauna of the cave (as well as a few foraged goods here or there from near the cave) and still maintain their population/way of life?