Need help finding movie title?

All I can remember from the movie is everyone is forced to live underground and they travel by ship (Space Ship, not Water Ship) through metal tunnels while Alien things are after them.
Somewhere near the end they make it to the safe area (A Giant Opening underground of settlements and gateways) and they discover the aliens are on the way and hundreds of these flying aliens pour in from the roof of the tunnel and the soldiers get into these giant mechanical things and start shooting them as they come through.
I can’t remember the title, I know there is a teenager that helps with the cargo and he wishes to fight but nobody lets him.

Is anybody able to help me out?
Thanks in advance