Botanical Gardens--Part 2

Find and Shut Down the Generator Powering the Flooded Corridor

After the Joker departs, you'll find the water has been electrified and you'll have to cut the power at the source. Use your Detective Mode and follow the cables back into the previous room, then through the eastern door, through the Statue Corridor, into the Generator Room.

Inside the Generator Room, you'll find a group of baddies, one of whom's armed with a stun rod. Focus on him first, then go for the remainders. Afterward, grab the Interview Tape from the console on the left, then use the Sequencer on the Control Panel along the left wall--you'll have to find the proper frequency three times to deactivate it. This will shut down the generator allowing you cross through the Flooded Corridor, so head back there!

Back in the Flood Corridor? Good--cross the room and enter the vent on the far side. After exiting, blow your way through a weak wall and continue through the door into the Abandoned Chamber.

The Abandoned Chamber can be confused, so follow these directions: From the entrance, head left, jump the gap, then proceed down the staircase (into the central structure), then up another set. Jump the gap and proceed through the door. Climb the ledges within, then grapple into the vent overhead.

Take down the pair of guards upon exiting the vent, then talk to Jordan Fraser, who's nearby.