Island Surface--Part 2

Scan the Batmobile Crime Scene Area to Isolate a Forensic Trail

After grabbing the gel, activate detective mode and scan the pipe on the ground, near the front of the Batmobile, to complete this objective.

Locate Gordon by Tracking his Discarded Tobacco

Use detective mode to follow the trail of tobacco leading from the nose of the Batmobile up to a locked door ahead. Thankfully, there's an alternate entrance on a weak wall just right of the locked door--detonate some gel there to reveal it.

Remain in detective mode and follow the path through the tunnel, back outside. Continue to stick to the path, following the tobacco down the ramp and up the staircase to a walkway which leads to a group of several inmates by the entrance of the Medical Facility. Take them down then proceed through the main entrance into the Medical Facility.

Find an Alternate Route Into the Medical Facility

Inside you'll run into Harley Quinn, sheltered from attack by the electric fence. After she taunts you do find a way inside, you'll have to do just that! Exit back outside, then grapple to the roof of the facility. Now follow the roof to the left side and use detective mode to spot a weak wall amongst a damage portion of the building. Use your explosive gel to blow it open, revealing a hole you can drop into. Proceed through the door within.