You can run through the Alley way to escape the first wall of light. OR you can follow the wire, take out a few enemies and then dispose of the oil tank.
For the second wall it is the same thing. Just remember for walls of light, there is always power comming from an oil or fuel tank. Best way to see where it is comming from is following the wires.
Two side quests in this area, Granny Rags and The Archive. Granny rags is worth it, the archive is only worth it for story. See Side quests section for more information.
New Enemies called Overseers will be encountered in this area. They hold grenades. Sometimes they come with watch hounds.
For Safes In this area once again see safe section. Same for gadgets. I will only be covering HARD parts in the walkthrough section. The reason for this is it is mostly marker based.
Saving Martin is easy as well. There is only one guard which is an overseer watching him. Just take out the overseer with stealth to keep things quiet a nice choke out will do. Then pull the lever to release Martin.
Finally you may pick up a note that will change your objective, even if you don't it is still possible to POISON the High overseer.
When you make it to his room, just click his wine glass, then choose to poison it. We want to keep Cunrow alive as it is a favor for a lady friend from Hound pits. You may still kill them both if you please. This is the simpliest and quietiest way of taking out The High Overseer. Pick up his black mail journal off his dead body when you get a chance then leave and head back to marker which is Samuel this will complete the Mission.
If you want the Solokov paintings as well as all Seven Runes, check the rune section. Also check painting section. If interested in all 3 safes check safe section. Finally if interested in outsider shrines check that section of this guide.