I mean...the Allagans had space travel before eventually dying off. So they legit could bring in a group from a colony or something started by a group of Allagans who fecked off into space.
If you read some of the descriptions for each turn of I believe Second Coils of Bahamut. It makes mention on I believe turn 3, about your group finding themselves not only 3KM underground, but inside of a Ragnarok-class starship.
So, the option is there but it is also a ridiculously silly idea.