Instructions
Switch to the Batwing. In the previous area, you had to take control of the helicopter to blow up a pipe blocking your path. To take down the wire in this second area, you will need the Batwing and its ability to drag mines behind it.
Pick up mines. You will need at least two mines to take down the wire, but you can pick up as many as three.
Release one mine on the tower to the left of the wire. Wait until you see the four purple arrows pointing to your target and release the mine.
Release a second mine on the tower to the right of the wire. Again, wait until you see the four purple arrows around your target before you let go of the mine. After you successfully explode the second tower, the wire will automatically disappear.