The entire premise of this movie is completely ridiculous. This tribe of indians is living underground and they can survive without light, they can grow crops too. It does try to present a moral cause, but the unwillingness of Feivals father to do anything about their situation seems counter to the character he became in the original. And the animation is terrible.
An American Tail: The Treasure of Manhattan Island
(1998 Video)
How do they grow crops in a tunnel underground?
30 March 2001