"Push minecart to crusher" is an objective in the sidequest Minecart Mischief in Borderlands 2
Walkthrough[edit]
Push the minecart forward until it comes to a halt. You will be prompted by a robotic voice to release the first airlock. En route you will likely encounter a few Crystalisks. This will get you to the first airlock.
Past Airlock 1
Head on forward, pushing the cart. Tannis will contact you again and tell you a bit more about the history, though not much more. As you get to the second airlock you will need to deal with a small number of Threshers and likely a Varkid or two as well.
Past Airlock 2
Cart still needs pushing. Tannis will tell you a bit more. There are more Varkids to be dealt with.
Past Airlock 3
This leads to the crusher. Open Airlock 3 and more forward from there. Tannis concludes her story.
