7.2. The Duke Dome: Part 2 | Campaign Duke Nukem Forever Guide
Last update: 11 May 2016
You will reach a square with a few containers, but without any escape route. In order to get out, you need to collect all the blue barrels and throw them into the red container which you will be able to climb to the scaffolding.
In order to gather enough barrels, you will have to detonate red barrels in one of the higher containers.
Cross the scaffolding to the vast square where you will find a crane with a demolition ball. The crane will come in handy in a bit, but first you will need to power up the battery. Go onto the crane arm and get to the other side of the fence.
Inside the room at top of one of the constructions you will find the needed battery and lots of RPGs and ammo crates throughout the whole square.
They are there for a reason, as you're about to fight an alien spaceship. Feed it with a couple kilotons of explosives and go through the fence along the beam that has fallen onto the ammo crate.
Return to the crane, insert the new battery and make use of the demolition ball on the nearby building's wall to create a passage into the alien base.