On the Mothership Battle level right after you destroy the ship and pass out, you will awake and will have to melee your way through a vent.

When in the vent system you have to go left to progress in the level, instead turn right and keep going until you hit another vent, melee that and go around the corner, look down, and enjoy!

Does Duke Nukem have no shame?, evidently not

Hail to the chief!!

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