"Find Sub-Level 13 entrance" is a mission objective in the side mission "Sub-Level 13" in Borderlands: The Pre-Sequel
Head out of the Fingersmith Halls to the North. Get to the Fast Travel Station and use it to quickly get to the Titan Robot Production Plant. Once you arrive there you can just take a quick turn to the right. This will take you immediately over to the Titan Industrial Facility. This save quick change in destination ensures you don't have to go across the whole area to get to your destination.
Once you get there head to the Marked location on the map. You will want to go over the Eastern edge and drop all the way to the ground. When you land, look to the North. You will see a room with atmosphere. Head inside it to find the entrance to Sub-Level 13. Go on through the door.
Sub-Level 13 Mission Objectives
- Find Sub-Level 13 entrance
- Descend to Sub-Level 13
- Find space-fold inverter
- Disable junction box
- Search vents
- Listen to Harry's ECHO
Turn in: Harry's Remains