How to get past the Cooling Tunnel D - Batman Arkham City Episode 40
In this episode I am in the Cooling Tunnel D and have to progress by getting past more goons, rescuing bad guys, traversing the waterways with my freeze blast and using my remote controlled batarang to activate switches. Taking out the goons is easy but then I have to negotiate the underground water channels using a block of ice and a batarang. I have to be careful to avoid hitting the churning cockscrews. Eventually, I reach a locked door which can be activated if I could only reach the switch. Watch me make several failed attempts at activating the switch with my batarang before I finally realize that my batarang has to be charged along the way. You will see an electrical device which is dangerously arcing and your batarang has to pass through this to pick up the charge. Once I have activated the switch the door opens and I can continue my journey towards the guy with the baseball bat. I was hoping to carry out a surprise takedown but she surprises me with an unexpected attack. It's Doctor Stacy Baker who we met in a previous episode.