Miagani Island Tunnel Network

Head to Wayne Tower in the south-eastern corner of Miagani Island.

Grapple to the balcony near the top and interact with the shuttered door.

Head inside for a cutscene (a non-interactive cinematic the game plays automatically) (a non-interactive cinematic the game plays automatically) with Lucius.

Use the computer behind the desk to update your objectives.

You will have the opportunity to equip a new upgrade to the Batmobile: the CPU Virus (allows hacking of Drone Tanks) or the Weapon Generator MKIII (increases weapon damage).

Exit Wayne Tower and make your way to the waypoint (a marker on your map you've manually placed as a destination) (a marker on your map you've manually placed as a destination) for the tunnel network entrance.

Approach the tunnel entrance using rooftops or the raised train track to avoid the large number of Drone Tanks.

Summon your Batmobile and clear out the approximately 28 Drone Tanks guarding the entrance. This group includes 23 Rattler units, two Diamondbacks, and three Mamba units. Prioritize shooting Mamba missiles with the machine gun, use the dash move to avoid fire, get critical hits on turrets, and use Missile Barrage when available.

Approach and park in the Batmobile marker at the tunnel entrance to open the door.

Enter the tunnel and use the Batmobile's Power Winch to pull down a ventilation fan on the roof when a door blocks your path.

Exit the Batmobile and use the Batclaw to grapple up into the opening.

Use Explosive Gel on the two weak walls and pull the grating off the wall at the end.

Continue through the passage until you exit into a room with a large spinning fan.

Use the Line Launcher gadget to cross the gap.

Use the Remote Controlled Batarang to fly into the hole in the wall on the left and hit a button on the wall above a set of toilets to open a gate.

Use the Line Launcher to access the hallway behind the open gate.

In the next fan room, use the Remote Controlled Batarang to fly through a small hole in the wall and hit a button inside to open a gate to your left.

Target the far wall with the Line Launcher, but as Batman travels across the fan, look left and fire the Line Launcher a second time through the open gate.

Continue through the short passage and immediately look right upon exiting into a larger room to find a Riddler Trophy.

Approach the railing to observe the room below. Touching the floor will result in instant death due to Drone Tanks and armed soldiers.

Grapple down to the girder ahead. Turn back towards the balcony you entered from and use girders and high points to move across the top of the room.

Look across to the opposite wall and use the Batclaw to enter a vent on the wall.

Slide down to a passage beneath the floor, follow it to the end, and exit into a waiting room for a cutscene.

After the cutscene, you will be in a combat situation against a Brute.

To defeat a Brute, use your stun button (B or Circle) until stars appear above their head, then attack. Environmental takedowns using glowing blue objects are also effective.