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Duke Nukem 3D Hints
Where is the blue card?
1 of 5: The blue card will activate an elevator that will take you to one engine, which is on the right side (as you're facing at the start of the level) of the ship.
2 of 5: You will find the tram to move from one engine to another.
3 of 5: Go down the other lift on the left side.
4 of 5: Sift through all of the wreckage.
5 of 5: You should find a small alcove you need to duck to get into -- the blue card is there.