Hypothetical Scenario

Hypothetically, what if you took one person from every location/region with a distinct accent and put them all together in a large, self-sustaining space ship.

They don't contact Earth, they just simply and happily exist in an intermingled, joined isolation for generations.

After generations of finding ways to communicate and reproduction, what would the people look like? What would their accent sound like? What language would dominate? Etc etc..