Investigate the unknown ARC machines

How do you complete "Investigate the unknown ARC machines"?

This is step 4 of 4 in Reduced to Rubble, given by Shani. It is completed on The Blue Gate. The exact location is marked on the The Blue Gate map.

• Reduced to Rubble
• The Blue Gate

What are the other objectives in Reduced to Rubble?

Reduced to Rubble has 4 objectives in total: Take a photo of the Collapsed Highway, Go to the Broken Earth, Follow the trail of destruction through the Broken Earth and Investigate the unknown ARC machines.