You start the chapter on your ship, in the center of a floating dock area. There are defenders on the platform ahead, but there’s a decent amount of experience and treasure to find as well.
Disembark and fight all of the enemies around the circle. It takes a while to clear them all, but doing so unlocks the door at the back-left side of the circle. Bring someone with high damage output for this fighting because the enemies have substantial health.
Once you unlock the gate, look at a pink door on the right side of the battle area. There is also a Live Wire Lock that is accessible after the battle. Use that now!
Inside the lock, jump into the air stream on the right to zip over a button. This gets you to the bottom of the map. Move over the button down there to collect a Spark and get back to the top. Use the stream on the left now to get the Second Spark. Press the bottom button again to get to the top and start the nearby cog’s rotation. Collect the Spark inside that cog. You’re done. Use the left stream again to get to the bottom, and leave the puzzle via the exit on the left.
The Epic Treasure Chest you earn is inside the building. Go down and grab it.
A walkway on the left takes you over to a Random Reward Object. On the back-right there is a similar passage that leads to an Epic Treasure Chest. Get both of these and then go through the unlocked gate at the back of the circle. Get into a land vehicle and start a challenge there.
You come to rest by a massive lake of sludge and whatever else in down there. It’s better not to check.