Minecart Mischief

Minecart Mischief

This can be started by examining the old Echo on a post in the Caustic Caverns. You can find this on your way to the third evidence during the optional mission 'Perfectly Peaceful'

Keep pushing the cart along the rail and opening the airlocks along the way. Once you've reached the infested tunnel, take out the large group of varkids and sell your loot as well in the lone vending machine past the door to east.

Open the third airlock and push the cart to the marked location. Pull the lever and take out the varkids that will attack you. Once done, pick up the raw eridium and turn in the mission by examining the rock nearby.